Please think carefully before you decide to run it, it cannot be undone
unless you backup your "catalog.db", which might be a wise thing to do as this is an unsupported hack:
The Last Update Column added in 4.2 doesn't automatically fill with any dates for some older resources and for some 3rd party products.
Before appling hack, please look at both the pictures, to see the difference because it will change existing data,
Before:

the update date as far as I can tell is the date of download, this hack will set all dates to the local books' version date, however it will replace all dates
After:

Both files need placed in the <Logos4>Data\<random> folder an then run: SetLUdate.exe from there
5707.SetLastUpdate.zip