While looking at some unrelated issues in the d.org queue for Token 8.x, I noticed a new setting in the UI, which we don't have:

This seems to have been added only in the 8.x version, with https://www.drupal.org/project/pathauto/issues/2773573
GitHub Issue #:
4755
Recent comments
Thanks, the /tmp folder was the problem. I moved it elsewhere and then the updated worked. Thanks again!
Update 1.35.1 appears to install but hasn't
Probably not the reason, but worth to do a quick check: Sometimes the update cache interferes, so if something's odd with updates - some module (or core) claims to have updated, but then...
Update 1.35.1 appears to install but hasn't
Nope, not touched any permissions!
Update 1.35.1 appears to install but hasn't