Is it possible to downgrade version / get rid of the banners in new version

I downloaded the latest version a few days ago and now there is now a banner at the bottom telling me to buy the premium. Minor changes is the ‘free’ text next to the icon in the top left, and another premium tag where it was a small ‘upgrade’ button and for some reason an account icon in the top right, also the security instead of firewall which I don’t mind and is actually helpful.
I would understand these banners and text about buying the premium version if it was a free trial but it is a free app with a premium right? In my opinion, it is too much, it was fine before
I know that this is to get people to buy the premium but I am not going to… is there a place to download for an older version that doesn’t have all of these annoyances?