Siemens has decommissioned direct public downloads for V5.5 due to its "discontinued" status. As one Siemens notice states, the software "is not supported and maintained by Siemens anymore. It may contain defects". However, if you have a valid service contract, you may access it via the Siemens Industry Support portal. For full installation DVDs, you can order the "Trial License" via order number 6ES7810-4CC10-0YA7, which includes STEP 7 V5.5 with SP2. You can also install the base trial version of STEP 7 Professional 2010 SR2 and then apply the SP2 update, which remains available in the official support entry (ID: 57026339).
If you are installing Step 7 V5.5 SP2 on a modern system, the installer will likely block you immediately. Use this registry and file modification fix to bypass the restriction: Simatic Step 7 V5 5 Sp2 Download Fixed
Includes the PROFINET Topology Editor for graphical and tabular views of network diagnostics. Siemens has decommissioned direct public downloads for V5
: If installing the entire SIMATIC WinCC or STEP 7 Professional suite, install components in chronological order: STEP 7 base program, Service Packs, Hotfixes, and then visualization packages (WinCC Flexible). However, if you have a valid service contract,
Because Service Pack 2 fixed critical bugs from SP1, including issues with Profibus DP master configuration and S7-Graph runtime errors. For many plant engineers, V5.5 SP2 is the last truly stable version before the mandatory switch to TIA Portal.