If you're using Version 9 and lower, you will require Microsoft Visual studio Fortran and C/C++ libraries before you can export the model for use in Hysys or Plus.
If you're using Version 10, provision is provided to export the model in a suitable format for use in version 10 of Hysys or Plus.
Check out this tutorial: https://submodelist.blogspot.com/2015/07/membrane-reactor-level-2.html