plz upgrade this project to Unity2019.4.1

[GITHUB243884919]

Open this porject by Unity2019.4.1f1, there is a lot of error. I check the package manger , some import packages show red color.

[tuunit]

You you want a working version you can check out my fork. But a lot has changed since this presentation therefore this repository might not be your best bet as a reference anymore.
https://github.com/tuunit/AngryBots_ECS

[humbertovirtudes]

check out my fork for a version updated to Unity 2020.3

https://github.com/humbertovirtudes/AngryBots_ECS_2021.3