Hi,
I experienced the same when I triggered the update of the newsletter plugin from the wordpress interface (Time-stamp of the files: 15:18 CET). Changelog shows : 8.9.6.
I could mitigate by downloading the plugin-zip-library and overwriting the folder in the wordpress plugins.
Time-stamp of these files: 15:29 CET.
So reading your reply, I probably triggered the update just in the time-frame where the wrong version was on the wordpress-servers.
Kind Regards,
Jeroen Jaspar
SiteAdvice