- Avast! Manual Virus Definitions Update Download - avast! Virus Definitions Update - Manual Download VPS Update, ensure that you download the one for avast 4.8 (virus definitions, vpsupd4.exe, approx 41.84MB). - Save the file to your hard disk, locate where you saved it and double click it and that should carry out the virus definitions update.
Note: Ignore the file name in the images of the page that is displayed after clicking the download link, they are for the main program, not for vpsupd4.exe which will be downloaded.