On my personal laptop, I Installed EndNote 20 (current version) upgrading from EndNote X9. When I launched EndNote 20 it was able to open my library files but the user interface would not operate nor let me navigate - nothing! I shut down and re-opened and same thing happened. I restarted my machine and launched EndNote 20 and same behaviour again. So I uninstalled EndNote 20 and reinstalled EndNote X9 and now EndNote X9 won’t open any one of my libraries saying that “the associated .data file is not in the same location as the .enl file” and to continue opening will corrupt the file. I tried opening anyway and sure enough my .data file was deleted. I recovered it using one of my two backups on external hard drives. I then tried to use the Endnote Recovery option and it said it “copied 0 files”. So now I am stuck!. However, as you can see from the attachment the .data file is indeed in the same folder as the .enl file. However, for ALL my libraries, now EndNote X9 won’t open any single one of them without generating the same error (also in attachment) and I cannot progress my Systematic Review, for which I am under time pressure. As a part time student that does the majority of my work at the weekend, to now miss an entire weekend of work will set me back a lot. Help!