Thanks for doing this!
If you don't mind a request about the construction of the spreadsheet, this isn't a huge deal but there are two things that could make the process of checking the links quicker: if the links to the archive in A were actual hyperlinks, they could be opened with one click instead of four and if there were no columns after column K, one could jump to it with the 'end' key instead of using the arrow carefully. My wrist would love you for it.