I found a solution. After downloading the file and unzipping it, right click on it and choose "Show Package Contents".
Then go to "Contents > MacOS". There you'll probably find a file in document format.
Now, open terminal and type "chmod +x ", and drag and drop the document in the terminal (which should fill the path)
You will be able to open the game after running the command
If it shows that the developer cannot be identified or something, go to "Privacy & Security" in system settings, scroll down and click open anyway.
This works for most of the apps affected by the issue