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bobnelsonfr - calibre Portable expects libraries to be in the where calibre-portable.exe is located, if the library is elsewhere you could use a symbolic link.
I can install calibre on a regular d:drive, even tho' c: is my system drive
I can uninstall it too.
But, before you go much further, you should read the last paragraph of this ==>>
I am getting errors with my calibre library on a networked drive/NAS?
BR