For a long time I've been using v10.78 and recently started experiencing really bad lag while editing videos. At the same time I also started getting a pop-up to update to v16.08 which didn't work, but I did have an installation for v13.67 which worked, but I couldn't import most videos. Earlier today I updated to v16.08 with an installation I found on this forum on someone else with the same problem, but the solution wasn't in the comments and seemed to be discussed in DMs.
I have tried updating versions as much as I could, reinstalling versions, and updating Windows. Older files do work, but I'm not sure what could've changed for files to stop importing. Reverting to v10.78 though, the files will import properly, but I would like to update versions so I don't get the pop-up anymore and to hopefully fix the lag and increase performance and have anything else versions part 10.78 added.