Same problem for me. 2 things you can do.
1.
Delete GameGuard.des, and before you start BlackShot, open Process Hacker/ or any other process suspender.
After you start BlackShot, immediately suspend the BlackShot process.
Open CE, add the GGBypass addresses manually, change the values, and freeze all of them.
Then resume BS and BS will start up with the GGbypass activated.
2.
Use the ggbypass dll by @wafinasi. Set it to auto inject on extreme injector.
After you start BS, the dll will automatically be injected. Then just press HOME before BlackShot loads to fullscreen.