[BetterRed]

Carlos - enter formats:"=ORIGINAL_EPUB" into the search bar

select all books, click the down arrow on the Remove button, select Remove files of a specific format, select ORIGINAL_EPUB

Job Done.

If you deleted the files manually, then the database will be out of synch with the book folders. My advise is to right click the Library button, select Library Maintenance->Check Library - it will first check the database integrity, it will then offer to "check the files in the library..." click Yes - it will rattle around and present a list of anomalies and options to resolve them - I can't recall the details, because I don't have an anomalies.

There is no need to add, delete or change data or names in the Calibre Library folders manually. Everything can, and should be done from within Calibre. At its heart Calibre has a relational database which is logically associated with the library folders and their contents, if one alters things in the author/book folders then things can go wrong. My advice is 'look but don't touch'.

BR