If you were using 3.2, you have all the system requirements installed so you just need to install the new version and it will take care of everything except for removing the physical 3.2 file. It will remove the old scheduled task automatically, and re-add the new one. If you’re using Server 2008, let me know as there is a bug in the new version with the scheduled task. If you’re 2012 or higher you’re good to go. After installing the new 3.5 version, simply go and delete the old version.