Which Rhino?

Why There are two version of Rhinocers 5 in my computer? I am still wondering which option I should select. There is Rhinoceros 5 and there is Rhinoceros 5(64-bit)…?

Please keep your titles short, ask your question in the body of the message, not in the title.

You should use 64 bit Rhino in every case unless you have a legacy plug-in that only runs in 32 bit.