Thank-you for your reply. I do not currently have 64 bit python installed – that is most likely the problem.
I tried the following versions two versions and was (incorrectly?) assuming that the .dll would be in the install folder as it is in the 32 bit version.
“PyRosetta.Windows.64Bit.monolith.mode=release.branch=devel-r56911.exe”
and
“PyRosetta.Windows.64Bit.monolith.mode=release.branch=release-r10.exe”