I updated the sites using the method you mentioned (*cog icon*-> Extension-> Install Extension)
However, for one of the sites the install apparently didn't work..
The webpage was referencing juery 3.4.1, but there was actually no files that were added to the site.
This has caused even the other dnn tools to disappear, as I believe they are making use of juery
I have since supplied the missing updated juery file, however the site still points to an empty location
because of the ?cdv= query...
since I cannot access dnn persona bar, is there any way to update the content version by other means please?