So, If I'm understand the numbering scheme, Meraki is trying to go towards something similar to Cisco IOS (ex 18.1, 18.2, etc).

It is KB5009543. I just spent 4 hours cleaning up the mess from the installation of that update.

Here's a document link, I found helpful when my company was switching over to RingCentral and ran into similar provisioning issues.https://support.ringcentral.com/article/9233.html#8.6.3.WhitelistDomains

The adobe files, I can’t help with checking the disposition on those. (Sorry). You’d likely have to contact Meraki Support.