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BTW I suggest you refund it until we see if this can be sorted out, you could try using the freeware version to test this out - https://zanthebonebreaker.itch.io/hedon
Download GZDoom 4 from here (get the latest version) - https://zdoom.org/downloads
Copy your Hedon folder from where Steam installed it somewhere else as backup. Then move the downloaded GZDoom archive in the installation folder and unzip it there, (say yes to replace all the files). Then launch the game via gzdoom.exe (not the Hedon launcher). Make yourself a desktop shortcut or Steam won't pick the right .exe to launch via the app.
Also, do you have any sort of graphic features enabled from your GPU that might interfere with OpenGL?