Hi Ainia! Welcome back!
So, from your post it sounds like you have upgraded to Catalina on an existing machine. If this is the case, then none of your wine wrappers will work anymore as Catalina will not open 32bit programs (or wrappers) or indeed wineskin winery. You may as well delete them all.
If you have a new mac preloaded with Catalina, do not attemp to install use Wine, wineskin or any other wrapper maker.
Once you have Crossover 19 installed (-it must be 19 as it is the ONLY version that will install 32bit games) then the next thing is to get your CC GoG installer files so follow this guide:https://support.gog.com/hc/en-us/articles/213148105-How-do-I-download-my-purchased-items-?product=gog
and put them in a new folder on your desktop.
Open Crossover and look at the bottom of the window and click on "Install unlisted Windows program"
In the next window, type "Deep Island Shard" and then click on next
In this new window choose "select installer file" and navigate to the new folder on your desktop and select the setup_uru_cc.exe file and then click next
In this last window, make sure you have the "normal" XP bottle selected and click install
The game should install normally, including PhysX. Do not launch the game after install, click finish on the GoG installer window.
Crossover will complete the bottle and you should be returned to the normal crossover window showing the bottle. This window should have two panes, a thinner left pane and a wider right pane. If you only have one pane, click on the icon (in the top left of crossover) with three tiny bottles. You should now have both panes visible.
Ok, now, to access the c drive in this new bottle, highlight it and click on the gear icon at the bottom of that pane and select show c drive.
You can now follow the DI installation (the same as you did with wine) to copy the DI files into the install.
Finally, Crossover has already created a launch icon in the Mac Launcher (spaceship) app BUT it is inside a folder called Crossover. It will be called Deep Island Shard. Drag it out of the folder so it is a stand alone icon in launcher (and then to your dock if you want a dock launcher.
Click the DI Shard icon .... and enjoy!
(if you need any help, just reply here!)
when it comes to Age creation ... "DOH" seems to be my middle name...