HSMExpress for Solidworks 2021
Well, it is not easy, but it is possible.
First Download HSM Express (it will be early 2021 version)
HSM Express Download at Autodesk
Then, painfully have it mess up your SW 2021
Go to your Autodesk Desktop Ap which will have an update populated.
Download and install the update
Viola, it works with SW 2021, or at least it stops crashing SW 2021.