Go to and click Web License Key Download .

Use the "Upgrade" function within the ALM to merge them into a single, valid V5.5 license. STEP 7 Professional Licenses MLFB - Siemens SiePortal

Surprisingly, Siemens still sells Step7 V5.5 licenses, though it is officially in "phased-out support."

; deleting trial files from this directory can sometimes resolve detection issues. Purchasing and Official Support Authorized keys and part numbers (e.g., 6ES7810-4CE10-0YB5

If you’re working with classic Siemens S7-300 or S7-400 PLCs, remains a staple in your toolkit. However, navigating the licensing landscape can feel like a project in itself. Whether you're setting up a new workstation or moving a license between machines, understanding how the license key works is critical to avoiding downtime. 1. Types of License Keys for V5.5

: Valid for a set amount of operating time, such as 50 hours, which only elapses while the software is active. Trial License : A full-functionality license valid for