Because V10.5 SP2 is a legacy version (released around 2010), it is no longer listed on the standard trial download pages.
I’ve checked the Siemens Industry Online Support site and noticed that the trial download is officially discontinued. Does anyone have advice on how to proceed? So far, I've found that: Tia Portal 10.5 Sp2 Extra Quality Download
Finding a TIA Portal 10.5 SP2 download is essential for maintaining older industrial assets. By using a virtual machine and verifying your file integrity, you can ensure an "extra quality" setup that keeps your S7-1200 systems operational for years to come. Because V10
Testing checklist (recommended before production rollout) So far, I've found that: Finding a TIA Portal 10
If you are looking for a reliable "Extra Quality" download and installation guide for this specific service pack, here is everything you need to know to get your legacy S7-1200 projects running smoothly. Why TIA Portal V10.5 SP2?