Laggy build, keeps losing frames, cannot turn off GPU acceleration, and cannot export

In every version of Premiere (Beta) version 26.x, I have experienced a major dip in performance, so much so that the app is frequently crashing. If I want to click a different part of my timeline, I often have to wait for 2-5 minutes before it is able to unfreeze and show me the part of the video I clicked over to. It keeps giving me the error message, "Error retrieving frame XX.XX.XX" and replaces it with another frame from way later in the video, or just makes it a blank slide. Looking online, it seems that turning GPU acceleration off can help with this, but I can no longer do that because of this update. And now, I cannot even export. Even a small portion of the video, trying to export it begins encoding, and stays on 0% forever, makes no progress ever. This is unusable at this point and it is very frustrating. Please help me. I have tried three to four different versions of the Premiere Beta, and nothing is working. Please, can I at least download a version of 25.0 so I can export my project even as one continuous video and port it over to Premiere Stable?