I had a similar problem. When starting DCS, it showed the splash screen and then quit.
I went through all the steps that were mentioned here with no success. Just before reinstalling Windows, I found in the DCS log information about problem with Lua path. After a quick investigation, I found the cause.
I had installed Lua language with Scoop, I don't even remember when and why.
After uninstalling Lua from the Scoop directory and removing the Environment Variables associated with it, I was able to run DCS without any problem. No Windows refresh/reinstall needed.
Hope this help somebody.
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