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In the ActionScript and MXML extension for Visual Studio Code, an asconfig.json file is used to store settings for a single project. It contains compiler options, AIR application settings, and more.
The asconfigc utility may also read the same asconfig.json file to compile the project from the command line.
If you run asconfigc -v and the version number does not match the newest version listed on the Node Package Manager website, you may have an out-of-date version of Node.js installed on your computer. When new versions of the asconfigc utility are released, the minimum version of Node.js required by asconfigc will typically be set to the major version of that is considered LTS (Long Term Support) at that time.
After you update Node.js, try installing asconfigc again.