I would add that there is NO reason you have to remove your 32-bit Sonar install, just because you also install the 64-bit version.
LOTS of folks, myself included, keep both 32/64 versions of Sonar installed. They happily can co-exist on the same computer.
This will give you a safety net, so that if you have trouble with any particular project in 64-bit Sonar using 32-bit plugins, you can always use the 32-bit Sonar to get around that set of issues.
So, I recommend you keep your 32-bit installed, and simply add a new install of the 64-bit Sonar.
Further, since you have a bunch of 32-bit plugins, I would go check to see if the vendor has updated any of those to 64-bit, and for the ones that have not, I would create a new sub-folder within your current 32-bit plugin folder, then test each 32-bit plugin to make sure they work in 64-bit Sonar, and if they do then move them to the new sub-folder. Add the sub-folder path to 64-bit Sonar in the Cakewalk Plugin Manager.
The nice thing about keeping a sub-folder within your existing 32-bit plugin path is that both the 32-bit and the 64-bit Sonars will pick up those plugins. The 32-bit Sonar will detect the sub-folder, since it is subordinate to the main plugin folder, which is already in its search path. The 64-bit Sonar will pick up ONLY those 32-bit plugins that have been tested by you to work in 64-bit Sonar.
And, you will have only a single copy of the plugins, using the above approach.
Bob Bone