Sorry, but this is not the fkin DJI support. Here are recommendations given by experienced and helpful users. Many donate precious free time for this basically good thing. The laptop purchase is solely your decision.
Nobody can 100% guarantee that everything will work, and that you will implement recommendations correctly.
If you have little computer experience, downgrading from Windows 10 to Windows 7 is not an option you should consider...
Actually, it's hard to imagine that the Assistant 2 is needed to calibrate any sensors so that your presumably new drone can take off. If it does not work right out of the box, then it's scrap that should be sent back ...