diff --git a/build.gradle b/build.gradle
index 14607a995dc..17b60df52f8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -34,6 +34,7 @@ configure(subprojects) {
         joptVersion = '5.0.3'
         langVersion = '3.4'
         libdohjVersion = '7be803fa'
+        bitcoinjVersion = 'cd30ad5b'
         logbackVersion = '1.1.10'
         lombokVersion = '1.18.2'
         mockitoVersion = '2.21.0'
@@ -133,6 +134,10 @@ configure(project(':assets')) {
     dependencies {
         compile("network.bisq.libdohj:libdohj-core:$libdohjVersion") {
             exclude(module: 'protobuf-java')
+            exclude(module: 'bitcoinj-core')
+        }
+        compile("com.github.bisq-network.bitcoinj:bitcoinj-core:$bitcoinjVersion") {
+            exclude(module: 'protobuf-java')
         }
         compile "commons-codec:commons-codec:$codecVersion"
         compile "org.apache.commons:commons-lang3:$langVersion"
@@ -170,6 +175,11 @@ configure(project(':common')) {
             exclude(module: 'guava')
         }
         compile("network.bisq.libdohj:libdohj-core:$libdohjVersion") {
+            exclude(module: 'slf4j-api')
+            exclude(module: 'protobuf-java')
+            exclude(module: 'bitcoinj-core')
+        }
+        compile("com.github.bisq-network.bitcoinj:bitcoinj-core:$bitcoinjVersion") {
             exclude(module: 'jsr305')
             exclude(module: 'slf4j-api')
             exclude(module: 'guava')
@@ -354,7 +364,6 @@ configure(project(':pricenode')) {
 
     dependencies {
         compile project(":core")
-        compile project(":assets")
         compile("org.knowm.xchange:xchange-bitcoinaverage:4.3.3")
         compile("org.knowm.xchange:xchange-coinmarketcap:4.3.3")
         compile("org.knowm.xchange:xchange-poloniex:4.3.3")
diff --git a/core/src/main/java/bisq/core/offer/Offer.java b/core/src/main/java/bisq/core/offer/Offer.java
index 92b3bf76d6d..8d4c272e5a7 100644
--- a/core/src/main/java/bisq/core/offer/Offer.java
+++ b/core/src/main/java/bisq/core/offer/Offer.java
@@ -70,11 +70,11 @@
 @Slf4j
 public class Offer implements NetworkPayload, PersistablePayload {
 
-    // We allow max. 0.5 % difference between own offerPayload price calculation and takers calculation.
+    // We allow max. 1 % difference between own offerPayload price calculation and takers calculation.
     // Market price might be different at maker's and takers side so we need a bit of tolerance.
     // The tolerance will get smaller once we have multiple price feeds avoiding fast price fluctuations
     // from one provider.
-    final static double PRICE_TOLERANCE = 0.005;
+    final static double PRICE_TOLERANCE = 0.01;
 
     ///////////////////////////////////////////////////////////////////////////////////////////
     // Enums
diff --git a/desktop/package/windows/Bisq-setup-image.bmp b/desktop/package/windows/Bisq-setup-image.bmp
new file mode 100644
index 00000000000..bfa68915528
Binary files /dev/null and b/desktop/package/windows/Bisq-setup-image.bmp differ
diff --git a/desktop/package/windows/Bisq.iss b/desktop/package/windows/Bisq.iss
index 23264dc73c7..ad1bfe1a803 100644
--- a/desktop/package/windows/Bisq.iss
+++ b/desktop/package/windows/Bisq.iss
@@ -1,14 +1,17 @@
-;This file will be executed next to the application bundle image
+;This file will be executed next to the application bundle image
 ;I.e. current directory will contain folder Bisq with application files
-[Setup]
+;Note: This file must use UTF-8 encoding with BOM
+
+#define SourceDir GetEnv('package_dir') + '\windows'
 
+[Setup]
 AppId={{bisq}}
 AppName=Bisq
 AppVersion=0.9.1
 AppVerName=Bisq
 AppPublisher=Bisq
-AppComments=Bisq
 AppCopyright=Copyright (C) 2018
+AppComments={cm:AppComments}
 AppPublisherURL=https://bisq.network
 AppSupportURL=https://bisq.network
 ;AppUpdatesURL=http://java.com/
@@ -16,55 +19,55 @@ DefaultDirName={localappdata}\Bisq
 DisableStartupPrompt=Yes
 DisableDirPage=Yes
 DisableProgramGroupPage=Yes
-DisableReadyPage=Yes
-DisableFinishedPage=Yes
+DisableReadyPage=No
+DisableFinishedPage=No
 DisableWelcomePage=Yes
 DefaultGroupName=Bisq
 ;Optional License
 LicenseFile=
-;WinXP or above
-MinVersion=0,5.1
 OutputBaseFilename=Bisq
+;Windows 7 with Service Pack 1 or above
+MinVersion=0,6.1.7601
 Compression=lzma
 SolidCompression=yes
 PrivilegesRequired=lowest
 SetupIconFile=Bisq\Bisq.ico
 UninstallDisplayIcon={app}\Bisq.ico
 UninstallDisplayName=Bisq
+WizardImageFile={#SourceDir}\Bisq-setup-image.bmp
 WizardImageStretch=No
 WizardSmallImageFile=Bisq-setup-icon.bmp
 ArchitecturesInstallIn64BitMode=x64
-ChangesAssociations=Yes
+ShowLanguageDialog=No
 
 [Languages]
-Name: "english"; MessagesFile: "compiler:Default.isl"
+Name: en; MessagesFile: "compiler:Default.isl"
+Name: de; MessagesFile: "compiler:Languages\German.isl"
+Name: fr; MessagesFile: "compiler:Languages\French.isl"
+Name: sp; MessagesFile: "compiler:Languages\Spanish.isl"
+
+[CustomMessages]
+en.AppComments=The decentralized exchange network
+en.AppIsRunning=Bisq is running, please close it and run setup again.
+de.AppComments=Das dezentrale Austauschnetzwerk
+de.AppIsRunning=Bisq läuft, bitte schließen Sie es und führen Sie das Setup erneut aus.
+fr.AppComments=Le réseau d'échange décentralisé
+fr.AppIsRunning=Bisq est en cours d'exécution, fermez-le et exécutez à nouveau le programme d'installation.
+sp.AppComments=La red de intercambio descentralizado
+sp.AppIsRunning=Bisq se está ejecutando, ciérrelo y vuelva a ejecutar la configuración.
 
 [Files]
 Source: "Bisq\Bisq.exe"; DestDir: "{app}"; Flags: ignoreversion
 Source: "Bisq\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
 
 [Icons]
-Name: "{group}\Bisq"; Filename: "{app}\Bisq.exe"; IconFilename: "{app}\Bisq.ico"; Check: returnTrue()
-Name: "{commondesktop}\Bisq"; Filename: "{app}\Bisq.exe";  IconFilename: "{app}\Bisq.ico"; Check: returnFalse()
+Name: "{group}\Bisq"; Filename: "{app}\Bisq.exe"; IconFilename: "{app}\Bisq.ico"
+Name: "{userdesktop}\Bisq"; Filename: "{app}\Bisq.exe"; IconFilename: "{app}\Bisq.ico"
 
 [Run]
-Filename: "{app}\Bisq.exe"; Description: "{cm:LaunchProgram,Bisq}"; Flags: nowait postinstall skipifsilent; Check: returnTrue()
-Filename: "{app}\Bisq.exe"; Parameters: "-install -svcName ""Bisq"" -svcDesc ""Bisq"" -mainExe ""Bisq.exe""  "; Check: returnFalse()
-
-[UninstallRun]
-Filename: "{app}\Bisq.exe "; Parameters: "-uninstall -svcName Bisq -stopOnUninstall"; Check: returnFalse()
+Filename: "{app}\Bisq.exe"; Description: "{cm:LaunchProgram,Bisq}"; Flags: nowait postinstall skipifsilent
 
 [Code]
-function returnTrue(): Boolean;
-begin
-  Result := True;
-end;
-
-function returnFalse(): Boolean;
-begin
-  Result := False;
-end;
-
 procedure DirectoryCopy(SourcePath, DestPath: string);
 var
   FindRec: TFindRec;
@@ -122,7 +125,7 @@ begin
   entry := ExpandConstant('{localappdata}') + '\Bisq\';
   if DirExists(entry) then begin
     DelTree(entry, true, true, true);
-  end
+  end;
 end;
 
 procedure DeleteTorFiles;
@@ -137,15 +140,15 @@ begin
   hiddenServiceDir := mainnetDir + '\tor\hiddenservice';
   hiddenServiceBackupDir := mainnetDir + '\hiddenservice_backup';
   if DirExists(hiddenServiceDir) then begin
-   if DirExists(hiddenServiceBackupDir) then begin
-     DelTree(hiddenServiceBackupDir, true, true, true);
-   end
-   CreateDir(hiddenServiceBackupDir);
-   DirectoryCopy(hiddenServiceDir, hiddenServiceBackupDir);
-   DelTree(torDir, false, true, true);
-   CreateDir(hiddenServiceDir);
-   DirectoryCopy(hiddenServiceBackupDir, hiddenServiceDir);
-  end
+    if DirExists(hiddenServiceBackupDir) then begin
+      DelTree(hiddenServiceBackupDir, true, true, true);
+    end;
+    CreateDir(hiddenServiceBackupDir);
+    DirectoryCopy(hiddenServiceDir, hiddenServiceBackupDir);
+    DelTree(torDir, false, true, true);
+    CreateDir(hiddenServiceDir);
+    DirectoryCopy(hiddenServiceBackupDir, hiddenServiceDir);
+  end;
 end;
 
 function PrepareToInstall(var NeedsRestart: Boolean): String;
@@ -155,11 +158,44 @@ begin
   Result := '';
 end;
 
+function IsAppRunning(): Boolean;
+var
+  FSWbemLocator : Variant;
+  FWMIService : Variant;
+  FWbemObjectSet : Variant;
+  ExecutablePath : String;
+begin
+  Result := False;
+  ExecutablePath := Format('%s\Bisq\Bisq.exe', [ExpandConstant('{localappdata}')])
+  StringChangeEx(ExecutablePath, '\', '\\', True);
+  try
+    FSWbemLocator := CreateOleObject('WBEMScripting.SWBEMLocator');
+    FWMIService := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
+    FWbemObjectSet := FWMIService.ExecQuery(Format('SELECT Name FROM Win32_Process Where ExecutablePath="%s"', [ExecutablePath]));
+    Result := (FWbemObjectSet.Count > 0);
+    FWbemObjectSet := Unassigned;
+    FWMIService := Unassigned;
+    FSWbemLocator := Unassigned;
+  except
+  end;
+end;
+
 function InitializeSetup(): Boolean;
 begin
-// Possible future improvements:
-//   if version less or same => just launch app
-//   if upgrade => check if same app is running and wait for it to exit
-//   Add pack200/unpack200 support?
   Result := True;
+  if IsAppRunning() then
+  begin
+    MsgBox(ExpandConstant('{cm:AppIsRunning}'), mbCriticalError, MB_OK);
+    Result := False;
+  end;
+end;
+
+function InitializeUninstall(): Boolean;
+begin
+  Result := True;
+  if IsAppRunning() then
+  begin
+    MsgBox(ExpandConstant('{cm:AppIsRunning}'), mbCriticalError, MB_OK);
+    Result := False;
+  end;
 end;
diff --git a/scripts/install_java.bat b/scripts/install_java.bat
index 3a2f0ae1279..367157998b2 100644
--- a/scripts/install_java.bat
+++ b/scripts/install_java.bat
@@ -30,9 +30,11 @@ if exist "%PROGRAMFILES%\Java\openjdk\jdk-%jdk_version%" (
 
 echo Downloading required files to %TEMP%
 powershell -Command "Invoke-WebRequest %jdk_url% -OutFile $env:temp\%jdk_filename%.tar.gz"
-:: Download 7zip (command line version) in order to extract the tar.gz file since there is no native support in Windows
-powershell -Command "Invoke-WebRequest https://www.7-zip.org/a/7za920.zip -OutFile $env:temp\7za920.zip"
-powershell -Command "Expand-Archive $env:temp\7za920.zip -DestinationPath $env:temp\7za920 -Force"
+if not exist "%TEMP%\7za920\7za.exe" (
+    :: Download 7zip ^(command line version^) in order to extract the tar.gz file since there is no native support in Windows
+    powershell -Command "Invoke-WebRequest https://www.7-zip.org/a/7za920.zip -OutFile $env:temp\7za920.zip"
+    powershell -Command "Expand-Archive $env:temp\7za920.zip -DestinationPath $env:temp\7za920 -Force"
+)
 
 echo Extracting and installing JDK to %PROGRAMFILES%\Java\openjdk\jdk-%jdk_version%
 "%TEMP%\7za920\7za.exe" x "%TEMP%\%jdk_filename%.tar.gz" -o"%TEMP%" -r -y
@@ -41,8 +43,9 @@ md "%PROGRAMFILES%\Java\openjdk"
 move "%TEMP%\openjdk-%jdk_version%\jdk-%jdk_version%" "%PROGRAMFILES%\Java\openjdk"
 
 echo Removing downloaded files
-rmdir /S /Q %TEMP%\7za920
-del /Q %TEMP%\7za920.zip
+if exist "%TEMP%\7za920.zip" (
+    del /Q %TEMP%\7za920.zip
+)
 rmdir /S /Q %TEMP%\openjdk-%jdk_version%
 del /Q %TEMP%\%jdk_filename%.tar
 del /Q %TEMP%\%jdk_filename%.tar.gz