Application Manager suddenly running interference with Photoshop

I'm on an iMac running OS 10.13.6 (High Sierra) -- still -- and an older version of Photoshop. Nothing has changed on my system in months, or maybe years, but today, out of the blue, when I tried to launch PS, the App Mgr jumped up, briefly showed a screen saying it was validating my account, then went to a spinning wheel, asking me to "Please wait for a moment..." That never goes away. I chatted with someone @ Adobe who said my PS had reached its "end of life" and I had no choice but to update my OS, which is necessary to download the latest version of PS. Other Adobe apps (ID, AI, Acrobat) still run and my account is indeed current. Can anyone suggest a way to bypass AM or create an exception? Or some other solution -- besides finding a different photo editor? My system's stable, there are a couple apps I couldn't use if I upgraded my OS, but I rely on PS almost daily. [I need to click a Topic to post, and none of these apply. Apologies.]