It seems i may have found a possible solution. If i sort by format -> choose pdf -> select all -> bulk convert from pdf to pdf with the setting "Remove first image" turned on the cover image will be replaced with the one calibre has downloaded. Unfortunately this is very inefficient since the only thing i want changed is the cover. Also the conversion messed up the formatting of the first pdf i tried this on.
So, to get around this, is there a way to set the conversion settings to effectively "only convert" the first page? Or a way to change the settings so that no formatting or alteration whatsoever is made? Obviously a new file will be created but after the conversion i can simply delete all files called ORIGINAL_PDF and am left with all new covers for all my pdf files.
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