Just updated to new version and I did not uninstall the old one as I had read that the new version would remove the older version. On reboot found it had not installed correctly(unable to update manually and was not able to choose the type of scan) !! I did a system restore to see if if would go back to the previous version which it did not as it came up as an error on avast !! I then did a restore back to the current version and the new version is now working as it should Hope my ramble makes sense :-)
I got this as a dload directly over the top of V4 from the updates,i had a pop up come on screen telling me there was a new version available and it installed no problem over the top of my old version.Looks nice too.