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after I hit the 'play' button it seems that the game flashes but does not start. please help
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Issler_Gabriel: after I hit the 'play' button it seems that the game flashes but does not start. please help
please check our dedicated Support page:
https://support.gog.com/hc/en-us/articles/360019425753-Diablo

and see if the workaround listed under 'crash on startup' applies to you.
I'm having the same issue. I added Diablo.exe to the DEP list and I can start the game in classic mode now, but not the other one.
Same for me...