^ okay,
let me see:
first I need the filenames, old and new correctly synced in spreadsheet

the second column are the current names,
I'm going to revert back to the previous naming system here.
Following does require having
just the relevant files in a folder.
open Renamer,
select relevant folder - a doubled list shows in the main pane:
renaming is in the right column, so select that list

(I've reduced the tree pane on the left for the screenshot)
Copy relevant cells from your spreadsheet, and paste in Renamer (might be best to paste in text editor first and then copy again ensuring you have exactly the correct number of lines):

I think it was then:
menu: File > Apply changes to folderHope that works for you -- I did have to mess around a bit, but was doing it 'cold'
