I don't know why, but that is an old version of LW. At least the files LW couldn't move to Library are complete. So you can use them.

My guess is LW's been running for a long time & used up a massive amount of virtual memory. And as a result, you've run out of HDD space whilst LW was open or LW simply stopped functioning properly due to the VM build up.

It might be an idea to clean out some of your incompletes anyway as that will put much less pressure & stress & demand less VM on LW; Tip: Purge the Downloads Queue!