First, log in to your account page and make sure the Algoryx Momentum subscription has been assigned to your account.
Launch SpaceClaim. If you do not immediately see the Momentum tab in your toolbar, select File > SpaceClaim Options > Customize > Ribbon Tabs. Enable the Momentum tab.
Once that appears, you should see a Download button for the Algoryx Momentum package.
Install Momentum and restart SpaceClaim. You should now be able to access those functions.
Make sure to temporarily disable any antivirus or Windows Defender security measures during the installation.