Go back to v. 21

Today, one of my machines - automatically and without offering an alternative - updated from NIS v21.7.0.11 to NIS v22.5.0.124. I find the new version too complicated and don't like the way it looks.

I still have some time on my 2014 license and would like to downgrade (go back to v21). What will happen if I use the Norton removal tool to get rid of v. 22 and then install NIS-ESD-21.6.0.32-EN.exe?

Thanks.