Applying the well known 14.2-patch on Installation of 15.0beta1 is working perfect.

Sequence:
1. Install V-15.0beta1
2. In GM-15-Dir rename global_mapper.exe to global_mapper14.exe
3. apply patch
4. In GM-15-Dir rename global_mapper14.exe to global_mapper.exe
5. Enjoy on running GM-15.0beta1