Hi Dexter_Playz
I'm not with Laminar Research, just a fellow simmer in the UK.
I'm also sorry to say that the specification of your MacBook Air is far below even the minimum required, let alone the recommended spec's.
The Intel CPU is only 1.6GHz, whereas the very minimum required is 3.0GHz. The MacBook Air also has low end graphics as a part of the CPU and not the dedicated high graphics card such as a Nvidia GTX1070 that would be required.
If you wish to purchase XP11, then I'm afraid that you will need to upgrade your hardware significantly!
Sorry again for the bad news :-(
Regards