I am trying to instal Photoshop Elements 2021 on my 2021 imac running Big Sur.
Every time I click on the Photoshop icon I get the message.
'An Error has occured while installing selected updates'
Is there a solution to this problem.
Did you install from a DVD disc version? If so, uninstall your current program and download and install the latest update from this link.
If that isn't the issue, I'm afraid I know nothing about Macs, so can't help you further.
That's a macOS error message, so I'd make sure you're running the latest version of Big Sur (11.4 which was released a couple of days ago), then follow @Greg_S. 's advice and download a new copy of Adobe Photoshop Elements 2021.