RASAero II can run on a Mac by using Wine. Follow this guide for getting Wine installed but stop after completing Step 3. https://www.davidbaumgold.com/tutorials/wine-mac/ After completing Step 3, do the following steps Step 1. install WineTricks by using this command $ brew install winetricks Step 2. RASAero II (i think) is a 32-bit Windows application and won't run under the 64-bit prefix Wine uses by default. What you need to do is set up a 32-bit Wine prefix first, follow the below steps. execute these commands from the command line 1. $ rm -rf ~/.wine ~/.wine may not exist but do this anyway just in case, it's important. Also, "rm -rf" has no patience for ignorance. If you aren't familiar with it then delete the .wine hidden folder via Finder. 2. $ export WINEARCH=win32 3. $ winecfg wincfg will open a Windows GUI, you can just close it the defaults are fine. Step 3. Now you can install and start RASAero II with: 1. $ wine start RASAero\ II\ Setup\ Ver\ 22.214.171.124.msi 2. $ cd ~/.wine/drive_c/Program Files/RASAero II 3. $ wine start RASAero\ II.exe Edit: The windows version of RockSim will also run on Mac using the same method.