As James pointed out, the DVD contains an installer for both. The installer detects if you are running a 64 bit operating system and only comes up with that particular options dialog where you can choose 32 or, 64 bit if you are running a 64 bit operating system. Regards, Phil Muir Accessibility Training Telephone: US (615) 713-2021 UK +44-1747-821-794 Mobile: UK +44-7968-136-246 E-mail: info@xxxxxxxxxxxxxxxxxxxxxxxxxxx URL: http://www.accessibilitytraining.co.uk/ _____ From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On Behalf Of Julie M. Sent: 30 January 2011 15:10 To: ddots-l@xxxxxxxxxxxxx Subject: [ddots-l] sixty-four bit Sonar Hi. I bought Sonar 8.5 for 32 bit computers. However, I need to purchase a new computer, and it will likely be 64 bit. Do I have to repurchase the program, or can I download the sixty-four bit version? Thanks.