Downloading "Adobe Photoshop old version free" from third-party sites (e.g., FileHippo, OldVersion.com, or torrents) is a common vector for viruses, ransomware, and keyloggers. Even if an antivirus doesn’t detect anything, cracked software often contains hidden malicious code.
If you are a student or on a tight budget, consider Adobe’s (free mobile/web app) or the 7-day free trial of the current Photoshop. For ongoing free use, open-source editors are the safest choice.
For legitimate, safe options regarding old versions:
If you own a legitimate license for an older version (like Creative Suite 5, 5.5, or 6), you can still install it, but it may require accessing old installation media. How to get a legal old version of Photoshop - Photo.net
Click the three dots (...) and select to see available legacy installers.