My hard drive crashed with my LR 4 catalog and I had to send to send to data recovery company. Meanwhile, I bought new computer and started using LR5. I now have the LR 4 catalog and am trying to import it (as a catalog) into my LR5 master catalog. However, when doing so, there was an error and the import quit. I know how some of the photos that were in the LR4 catalog but not all. And none of the collections are appearing. It says "lightroom can not import this catalog because of an unknown error." I need to access the edits I did in Lightroom to some of those photos. Any advice on how to get this catalog (and its collections) to import? When I first started to try to import the catalog it had me update the LR4 catalog and renamed it to an LR5 catalog.
I'm only guessing: maybe the files/catalog was damage when the computer crashed (??) And maybe LR is saying "naughty you" for not backing up your images and catalog .
Hopefully others will have a proper handle on your problem.
or contact Adobe for help. LR is great but I find it can be as temperamental as a three year old walking past the lolly/sweets at the supermarket.
if you use Google search with your question's keywords, you will find out, that Adobe has some problems by importing the LR4 catalog into LR5. To my knowledge the old catalog remains untouched at least. Did you try to optimize your catalog: file > Catalog optimize (translated from my German LR) or a backup of the catalog used. By default Lightroom always asks if it should create a catalog backup
For the sake of completeness, here some links to LR4