1. Install Sandboxie, obviously...

2. Use Keymaker (run as admin), click on Patch.

3. (Skip this step if you are using x86 architecture OS.)
   Use dseo13b (run as admin), enable test mode and sign "SbieDrv.sys". Usually in (C:\Program Files\Sandboxie\)

4. Reboot

5. Use Keymaker again (run as admin), fill up the fields version and syscode by clicking on [...]
   Click on Activate.

6. Enjoy! ;)