Adobe does not host old versions (like 23.1) for public download. The only legal way to get exactly 23.1 is:
Without a paid plan, you cannot legally obtain 23.1 specifically. adobe premiere pro 23.1 free download
If you are looking for this specific version, you are likely interested in these specific updates: Adobe does not host old versions (like 23
Technically? Yes, via piracy. Legally? No. Safely? Almost never. Without a paid plan, you cannot legally obtain 23
The golden age of "safe cracks" ended around 2015. Modern malware is too sophisticated. By searching for "Adobe Premiere Pro 23.1 free download," you are entering a minefield designed to exploit video editors who are just starting out.
No thanks, I don't like to chatting with awesome people about stuff I love.