currently there's no version that formally support MC67. The first version to formally support MPA3.0 devices, like MC67, it's v4.0.
Said that, usually application written with RhoMobile Suite v2.2SP1 works correctly.
if the application you want to use on MC67 it's an Hybrid application, then you can just install the Shared Runtime, modify the config.xml you've there (don't use the old config.xml blindly, some setup may have been changed from v2.1 to v2.2) and run the app.
If the application you want to use, it's a native app using the shared runtime, you need to recompile it.