If you must use this specific version, you will need a workaround:
Version 5.2 sits at a unique historical crossroads. It was the final version before Arobas Music introduced the heavily encrypted .gpx format (GP6) and moved entirely to the RSE. While RSE was intended to sound more "realistic," it was a resource hog on the Macs of 2010—causing spinning beach balls and latency. Consequently, the community clung to the lean .gp5 format. guitar pro 5.2 mac
If you absolutely need GP5.2 on a Mac, run a Windows VM or keep an old Mac with 10.6–10.9. Otherwise, migrate to GP7 (has a GP5-like mode) or use TuxGuitar (free, can read .gp5 files). If you must use this specific version, you