David, this information is very helpful.
So far, on a second computer with identical backup Calibre installation, I tried first to do incremental updates from previous versions I had downloaded. (I may have created some trouble by not updating directly from the update option within Calibre which only offered 5.34.) At version 4 there were several blocked folders/controlled access issues, so next I just allowed Calibre to do the update to 5.34.
Then, advised there may be a corrupted library, so Calibre went through the rebuild process with the result "WARNING:Success" and "Restoring the database succeeded with some warnings, click 'show details' to see the details. The old database was saved as C:\Users\xx\Documents\LibraryName\metadata.pre_res tore.db." Details: "Failed to restore the books in the following folders:
C:\Users\xx\Documents\LibraryName\Author\Title with error. Only one Author/Book in the library was referenced in the error. After that rebuild process, when trying to open Calibre, It gave the same Warning Success and Details again, but I clicked OK and Calibre opened. I deleted the book with the error from within calibre.
Everything seems normal, books open in the viewer, conversions work as usual, and yes, just as you said, looks like I will have to reinstall or update some plugins. Now I'll have to explore new features!
Many thanks for the information you offered DNSB!
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