You can, but if you have Failover running make sure to move the resources over to the other node then roll back to last version then once back online move the resources back and proceed with the same method to the other node.
In the GUI go to Maint. > Software update then click on the last build that it was using and reboot. If there is none then go to your User Portal on our site and download the previous build and upload it in the same GUI location and reboot.
As I stated before just go to the GUI in Maint. > Software update then click on the last build that it was using and reboot. If there is none then go to your User Portal on our site and download the previous build and upload it in the same GUI location and reboot.