You can try to find it here:
Roland MC-505 Editor v2.0 Zip files
**[WINDOWS PC ONLY]**
**["or you can try to use Win XP - but Right click on the Application Setup file, then left click on [Compatibility] Tab...then put a check in [Compatibility Mode]..it will say "Run this program in Compatibility Mode for: [Windows 98/Windows Me]. Left click on Apply Button. Hit [OK] Button ..Your done... then run program again. - Had no problems running this in this fashion.]**
http://f1.grp.yahoofs.com/v1/cEv7SD4NsJ5A3t0Lx8uUj0kJmE0GKfyMODaLyhLE8NGeVIbeeppW7mc7WiOAwux0LVLxf5gOO4rhELTB8yPcy3jwvLnn/mc505ed.zip
You can sign up here for free, YAHOO discussion Group [Forum],
and find more stuff in the file menu..they even have a Service Manual for the MC-505.
Roland MC-505's discussion Group [Forum], at Yahoo! Groups.
http://launch.groups.yahoo.com/group/mc505/
Wikipedia - Roland MC-505 [More Info]
http://en.wikipedia.org/wiki/Roland_MC-505
Hope this helps.
Signing off from DJFLEX-mk2
my home page is:
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"PLANET ROCK! ~ yO gEt FuNkY"