Modern GIS is moving toward Software as a Service (SaaS). Many users dislike annual fees. The v2010 model was a perpetual license. Users searching for a "link" often already own a valid license key from a decade ago but have lost the installer. They don't want to pay for an upgrade to get an installer for software they legally own.
Therefore, if you are looking for the release from 2010, you are likely looking for Blue Marble Geographic Calculator 2010 . If you are strictly looking for Global Mapper 2010, you are looking for a pre-acquisition legacy version. blue marble global mapper v2010 x64 link
Because the 2010 version runs efficiently on modest hardware, it remains attractive for organizations with older PCs or for students who need a stable, lightweight GIS platform. Modern GIS is moving toward Software as a Service (SaaS)