Can I revert back from MM 12 update to the old one?

Hi.

I was having problems with some clips being pixelated. No matter what I tried, nothing would solve the problem. So I updated to the Windows 12 Essentials upgrade. 

Now MM has more options for file output formats and some of the tabs have slightly new looking interface. However, this update did not solve the problem. It actually made my movie making experience worse.

When I am setting the starting point for a clip for instance, it literally takes 30 seconds for it to actually do that and allow me to play the clip to see how it now looks. I can't be doing this a multi clip video.

Is my laptop not fast enough? I don't think that's the problem. Anyone else have this problem with MM 12?

The version of MM is 2012 (Build 16.4.3528.0331).

Can I get back to whatever previous version I was using? At least all the features worked instantly and allowed me to work quickly. And I don't mean 2.6!