moving users from 1.4.2 to 1.5 seamlessly
I have to move a lot of user from 1.4.2 to 1.5. I want to do this with least amount of problems to the users. The ideal way would be when the users click on the web link it automatically donwloads 1.5 and then launches the application. I understand this can only be done on windows but that is what I am looking for.
Any help in this regard would be greatly appreciated.