Some ZIPs are simply the old 30-day trial repackaged. Without a valid FlexNet or HASP key, the software will lock you out after installation.
The specific version, 10.6, indicates a particular release of the software. Software versions are typically updated to include new features, bug fixes, and compatibility improvements. trimble terramodel 10.6.zip
Trimble stopped selling new licenses for Terramodel around 2014, and by 2018, they ceased all activation support for older versions. That means any ZIP file bearing this name on torrent sites, uploaded.to, or Mediafire is one of three things: Some ZIPs are simply the old 30-day trial repackaged