Verdict
If you are looking to get a legacy system back up and running, please share a few more details:
Early users often noted that V10.5 SP2 was resource-heavy for the hardware of that era, sometimes leading to slow compile and download times. "Extra Quality" and Downloading Today Tia Portal 10.5 Sp2 Extra Quality Download
TIA Portal V10.5 SP2 Download: Legacy Siemens Automation Software Guide
The availability of such versions is confirmed by the existence of tutorials for various TIA Portal versions—V12, V18, and V20—that have been found on various forum and blog sites. The "crack" process invariably involves: Verdict If you are looking to get a
Typically Windows XP (32-bit) or Windows 7 (32-bit).
Engaging with these cracked versions of TIA Portal V10.5 SP2 carries severe and unadvertised risks that far outweigh any perceived benefit: Engaging with these cracked versions of TIA Portal V10
If you are absolutely certain you need the exact V10.5 SP2 version and have a valid license, there might be one option left. The Italian blog "ioprogrammo" maintains a list of TIA Portal versions along with their official download links, but it notes that links for very old versions (V10.5 – V12) may no longer work on Siemens' servers. If this fails, your only recourse is to contact Siemens support directly and hope they can provide access based on your valid license.
Compatibility and prerequisites