hfss v11

Can I can open the old hfss projects (v8 and older) with v11 ?
In version 9 and 10, I could open the .cls file to import old projects, but not in v11.

How to solve this problem ?
A script ?

Have you tried to import your old projects into v9 or 10, saved and then imported again using v11?

Yes, and there is no problem with this method....
... as long as you have the V10 version.

When V10 or V9 will not be available any more we can make nothing more
You can just make an import of sm3 file (geometry only) but setup, material, boundary will be lost.

For me, this is a big problem of backward compatibilty for HFSS v11

my v11 opens all pervious version files