Dropbox.com is a company that allows a person to share files with others online.
From our discussion offline, it sounds like you have received the files you need and have upgraded your scanner back to version 1.4 which did not assist with the problem.
With the added details, my guess is the affected scanner is not out of tune but suffering from poor reception for some reason. Possibly a broken antenna connection in the scanner is to blame or maybe the scanner was too close to a two-way radio once when it was keyed up which could have damaged the scanner. In any case, it sounds as if it either needs repaired or replaced.