I've added the updater component mentioned in previous post. To use it, simply run updater.bat

UPDATE: It seems that updater might be very slow at the beginning. It depends on amount of files in the directory, and if it's taking more than one second to proceed each filename (1st stage), please tell me about that.
If it's renaming files for more than 5 minutes, you need a fix.
Temp fix: remove lines number 9-46
UPDATE; Fixed in 4.1

4 Updater

• Updater is now included. You may think that it updates this tool, but it will download new pictures instead of the old ones saved locally.
• Many pictures may have new, higher resolution, not watermarked, not fucked up versions uploaded to e621. Updater will find all the new pictures and download them, moving your old files to "backup" folder.
• Still requires testing, since technically it will save parent of deleted picture. It may be the same picture, or it may be edited one (still i guess it should be better if the old one got removed from there)
• Only works with md5 filenames at the moment.
• Possible fix to authors: it should now get authors for not-md5 filenames too.