No window appeared after I clicked "play" the game. Can only force quit it...
I heard about installing wineskin can solve this problem and I tried this before, but somehow, the fan roared after I played the wineskin BG2 complete, so I degraded my mac to mojave considering it might be the 32-bit issue, still it didn't work on Mojave. Any solution to this?

Problem solved. What you need: Mac Mojave or lower version; the BG2 complete (classic) that you acquired through serial key.

What you need to do: Download BG2 complete, and then find this app icon in your Application in Finder, and Right click BG2 complete => Show package contents => Click "Contents" => Click "Resources" => Click "Game" => Right click "Baldur's Gate 2" => Show package contents => Click "Wineskin" => Set screen options => Cancel Check "Auto Detect CPU Info for Direct3D" => Done => Quit.

Now launch this game in Application again, and you can play it now.

This is a way I know that you can play BG1&2 vanilla in Mac while making sure your fan and CPU temperature work fine.

Hi infi, sorry for the late reply. I suggest you try to start the game before you set wineskin options. If you fail to start the game because of the security issue, then go to "system preferences", then "security & privacy", where you should be able to find a lock icon on the bottom-left corner. Unlock it, and tick above "allow this app to open or run" something. Then go back to the wineskin step to see any luck there.

Thanks for the support. Yes I got it after I startet the game and set the security options after it and so on...