Yes...Object enablers can be downloaded from their respective vendors and installed.
When you are downloading object enablers from Autodesk or other sources, download the Autodesk® RealDWGTM 64-bit version. When you are prompted for a host application, select Bentley CONNECT Edition - Autodesk® RealDWGTM.
Yes...MicroStation CONNECT Edition supports 64-bit enablers.
Yes...MicroStation CONNECT Edition supports object enablers that support RealDWG. This is important as not all object enablers support RealDWG. The best indicator that the object enabler support RealDWG is during installation it find the version of RealDWG that is installed.
The second way indication is after installation of the object enabler try opening the DWG files in MicroStation using the object enabler. The missing elements should now appear.
How to download latest Autodesk REALDWG new Portal?