For the 1st time I just killed every Adobe related process to go for sure (see my 2019.09.06 post).
For the 2nd time (see my yesterdays post) I had everything running (Chrome, Creative Cloud app) and I manage to rename "c:\Program Files (x86)\Common Files\Adobe\CoreSyncExtension" folder without closing anything, and just pressed Retry button after renaming and it updated smoothly.