To ensure a "fixed" and stable installation, you must ensure that are all updated to the exact same version (V12 SP1). If versions differ, the software will not start.
If official downloads fail repeatedly, legitimate industrial software archives exist. Never use torrents or cracked sites (malware risk is extreme). Instead, use:
Added support for the then-new S7-1500 PLCs , ET 200SP I/Os , and Comfort Panels . Common Installation "Fixes"
: TIA Portal V12 SP1 is primarily supported on Windows 7 (32-bit and 64-bit Professional, Enterprise, and Ultimate editions).