Use Photoshop elements for may years, Using a MacBook pro 2019 with Catalina 10.11.7 I just upgraded both to 2021, I uninstalled the 2019 versions and installed 2021, neither editor will open from the elements portal, thy start to load and stop. they DO open if I open them directly from the support folder. PLEASE ADVICE.
Please try these steps and let us know if they resolve the issue:
1) ClickAppleicon >>System Preferences
2)Security and privacy>> Click on thelockto unlock it then enter the administrator password
3) Hit the+icon and then add thePhotoshop Elements 2021 Editor(If you don`t see the Photoshop Elements 2021 Editor already listed, then click on theApplicationtab on the left>>selectAdobe Photoshop Elements 2021folder and open it>>OpenSupport filesfolder>>selectAdobe Photoshop Elements 2021 Editor).
4) Click on the lock again to lock it.
5) Try the Photoshop Elements editor now.
If the above steps do not fix the problem, then please uninstall and reinstall Photoshop Elements