When downloading software for free, especially from third-party sites, ensure you have a good antivirus program to scan the files. Additionally, consider purchasing software directly from the official Adobe website to support the developers and get official updates and support.
Searching for an unofficial "portable free" version of Adobe Photoshop 2020 (v21.x) often leads to third-party sites that may bundle malware, as Adobe only distributes Photoshop via the Adobe Creative Cloud subscription model. adobe photoshop 2020 v2110106 portable free
You won't receive critical security patches or new feature updates from Adobe. Is there a portable version of Photoshop? - Adobe Community When downloading software for free