Same question here. I've been able to keep moving by cancelling the prompt but I will have a non-zero number of users who will be running into this issue when they try to use Okta at the beginning of the month so we need to have a version of the plugin that will work with the most recent version of the OS.
My company is in process of deploying Okta to the company, and everyone with Windows 10 is having the same issue as well. I have the old plugin, and it is working fine. Is there a way to download the old version of the plugin?
This is currently a known issue with plugin version 5.6.0 and is being tracked and worked on via internal bug report ID OKTA-84356. Plugin version 5.5.2 should still install and work on Windows 10 until 5.6.0 has been fixed.
I have received a message today, they had me test a new plugin. It worked. I believe with how quickly they are working on this I expect the new plugin to be available soon. As I don't want to break any user agreements with them I am not going to attach that file here. But keep checking in Okta to see if they release a new plugin soon.