You can leave it and install any additional packs over the top. Regards, Phil Muir P J Muir Productions, Music And Audio Production Telephone: US (615) 713-2021 UK+44-1747-821-794 Mobile: UK +44-7968-136-246 E-mail: info@xxxxxxxxxxxx URL: www.philmuir.com/ ----- Original Message ----- From: Greg Brayton To: ddots-l@xxxxxxxxxxxxx Sent: Friday, March 06, 2009 5:29 PM Subject: [ddots-l] installing I have dimension already. Do I have to uninstall it before installing sonar 8, or can I leave it, or install over top?