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MetDeFiets - did you migrate the settings by copying the content of the configuration directory on the old computer to the configuration directory on the old computer
Use
Preferences->Miscellaneous->Open calibre configuration directory to see the locations
I've done this successfully a number of times. Its not guaranteed to work, so I suggest you backup the content of what's the new config directory before overwriting with the old; then Sods Law will kick in, and you wont need it
BR