Make version upgrade easier

[aolsson]

Upgrade Silverfast SE V 6 to new build. I would apreciate if I could simply run the install from the new build without having to delete the old program via the control panel. Most program products allow you to do upgrades without deleting the old version manually.

[LSI_Support]

If the installer search for the Plug-In folder you have the choose to select an other folder or to creat a new one.