The board is PRE-loaded with GRBL.
You don't need to be using the IDE at all unless you are changing the firmware.
If you have set up the machine and dialed in the driver boards you only need to connect to a program capable of sending a CNC file.
My personal favourites are the UGS PLATFORM for 3 axis work and LASER GRBL for yep LASER work.
It wont say on the board which version GRBL but every board I have had has been 0.9 so far.
Windows device manager should see a COM port when you plug the cnc board in.
That is the COM port you will select in the CONTROL program and not the IDE.
Uploading anything else will wipe the GRBL firmware so please dont do that.