Struggling with conversion of catalog from Lr 6.14 to LrC 15.3 (LrC 14.0)
I’m unable to convert or import from Lr 6.14 catalog. I have optimized etc., removed all links to moved files and else followed every advice I could find. Still no success.
I get the following message:

Lightroom faced problems, trying to upgrade the format of the catalogfile and can not use this catalog in this version of Lightroom.
After this I found various recommendations on using LrC 13.2 of 14.0, to make an intermediate version, for a final import to LrC 15.3. I managed to install LrC 14.0, repeated the conversion-atempt, but received this message:

We’re sorry. Lightroom couldn’t upgrade the catalogfile and can not import from it. You might want to upgrade the catalog, on the direct, by opening i with Lightroom 7.
The question is: Where can I find Lightroom 7, and - does any of you have a suggestion to how I should overcome my problem/challenge?
Regards
Tom Kaasen
Norway
