In the Fall of 2027, Basecamp will stop working on MacOS 28 ARM when Rosetta 2 is discontinued. I was able to get Basecamp 4.8.13 to work on a MacOS Monterrey VM (12.7.6) in Parallels Desktop 26 using 4 vCPU and 16 GB. Basecamp turns off 3D maps and it's a little slow but it is fully functional. I also tried it with a MacOS 15 and 26 VM but Basecamp maps redraws were choppy and the app would not work after the first run. I did not test it with a MacOS 13 or 14 VM. I hope this is helpful for some Mac users.
