I had been using Mcafee 4.5 for few years in different computers, so far no problem at all, I just downloaded & update the dat file regularly, but Mcafee just stop supporting the old version, no more dat file can be download. Now I have to buy a new one, like a 9.0, my question is can I buy one software and install in many computers as I want? Or this software can only be installed in one computer? Thanks.