I can't install Photoshop on my Mac

Which version of Photoshop?

Legacy Creative Suite products won't install on Catalina, Big Sur or Monterey.  You would need a subscription to the latest Photoshop CC.

install the cc desktop app from here https://creativecloud.adobe.com/apps/all/desktop?action=install&source=apps&productId=creative-cloud and use it to install your adobe subscription and trial programs.

if you have trouble downloading, use the alternative download site at page bottom here, https://helpx.adobe.com/in/download-install/kb/creative-cloud-desktop-app-download.html

p.s. if you have previously installed ps (or parts of ps), you may need to clean your system first using the adobe cleaner.