Guitar Pro 6 scales like crap on Windows 10 with HiDPI. This is how it looks on a 13" screen at 3200x1800.
I discovered a possibility of forcing blurry "zoom-scaling" for apps that render weird via an article at PocketNow, however GuitarPro 6 doesn't work at all with the manifest file there. I took a look at the manifest embedded within GuitarPro.exe and found a few differences and was able to create a working file.
Afterwards it looks like this, still at 3200x1800: