LR5.6 keeps telling me something about insufficient memory when I try to export files. Others are also having this issue, there are several threads on the net like this one:
https://forums.adobe.com/thread/1536164.
I have several hundred wedding photos to process and no time to dick around. LR4 was fine, but I deleted it recently. LR5.5 was working OK for me, not as good as LR4.
I don't want to discuss my laptop, because there's nothing I can do about it right now. It ran previous versions of LR, it does not get on with 5.6. How do I get back to a LR version I can use, without losing the processing I've completed on my photos?