Are you looking to to the newest version (Global Mapper Pro) or do you specifically need v20 for compatibility?
What are you planning to process (LiDAR, CAD, Satellite imagery)? blue marble global mapper v2010 x64 link
for high-resolution imagery and complex vector files. ⚙️ System Requirements Are you looking to to the newest version
Versions that crash during critical analysis. blue marble global mapper v2010 x64 link