The "2010_03_20" designation indicates that this particular repack was finalized around March 20, 2010, designed to handle license keys for versions of Siemens software prevalent during that era, such as Step 7 V5.4/V5.5 or early WinCC Flexible versions. Historical Significance of the 2010_03_20 Repack
If licenses disappear after a system restart: simatic ekb install 2010 03 20 repack
Understanding Simatic EKB Install 2010_03_20 Repack: A Guide to Siemens Licensing simatic ekb install 2010 03 20 repack
The specific version refers to a modified bundled release distributed in March 2010. Core Functionality simatic ekb install 2010 03 20 repack