When installing RapidWeaver 7, we’d recommend removing older versions of RapidWeaver from your Mac by placing them in the Trash. However, if you’ve got some projects that you don’t want to migrate to RapidWeaver 7, you may well keep an older version on your Mac just in case.
As each version of RapidWeaver is a standalone app, any add-ons used in RapidWeaver 7are separate from the add-ons used by RapidWeaver 5 and RapidWeaver 6. When you have multiple copies of RapidWeaver on your Mac, you’ll need to take a slightly different approach when installing add-ons. This is because of each version of RapidWeaver notifies OS X that it can accept the add-ons you wish to install, however, it is OS X itself that determines which version of RapidWeaver to launch when you double-click on an add-on.
To ensure add-ons are installed for use with your intended version of RapidWeaver, right-click on the add-on, choose Open With... and choose RapidWeaver 7.