Just to set your expectations regarding the upgrade:

The upgrade from 1.4.5 to 1.4.6 is indeed much simpler than the upgrade from 1.3.x to 1.4.x since there are no database updates.

The upgrade from 1.3.x directly to 1.4.6 is still going to be difficult in the sense that users will have to increase their memory settings to at least -mx800m to be able to update their database schema.



Since we now have more nodes on 1.4.x it is also faster to download the blockchain from scratch if you are having trouble with the automatic database conversion.



Regarding the VirusTotal warning, perhaps this has something to do with the way Jean-Luc packages the zip file.