I am trying to make the upgrade to 2.5. Every time I attempt to run ";Virtual Drumline 2.5 Installer"; from the DVD, the Vise X installer crashes. I am making the upgrade on a 1.33 GHz PowerBook G4 with only 512MB of RAM (I realize that it is not the ideal machine for VDL). I was using VDL 2 with Sibelius 4 on this laptop but recently upgraded to OSX 10.5 and therefore needed to also make the VDL 2.5 upgrade. Is anyone else having this issue?