Paperpile standalone only supports M1 mac?

My Paperpile app on my MacBook Pro (15-inch, 2018) suddenly doesn’t work. I really love the standalone app. Is paperpile app drops support on non-M1 Mac?

Wait, didn’t even know there is a Paperpile app for MacOS that does not run on Chrome. Where do I get it? (I should say I love Paperpile running on Chrome, but still would like to check out the standalone version)

It works now when I restarted Chrome. I notice that the standalone is actually a Chrome app which resides in ~/Applications/Chrome Apps. But now I forget how I installed it…