junonexus: Why? How solve this problem? Why don't you warn customers that product in your store doesn't work? We are tired of paying TIME and money for products that do not work. I don't have time to deal with this shit. Their affairs on lack. I'm not english so I say so.
Real quick - Catalina is known to have issues with SEVERAL applications - so don't be surprised that it doesn't work with GoG stuff... yet.
What would probably be helpful is explaining the ERROR you're getting? Is there an Error Code? When does the error appear? Is it immediate? Does it launch - then error?
Again - the issue isn't with GoG - it's undoubtedly with Catalina OS.
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Ask GoG to include all the original files!
https://www.gog.com/wishlist/site/for_dos_games_if_theyre_scumvm_also_include_original_files