If you have something called $windows BT somewhere in your computer (search online if you have no idea what i am saying), then most probably you already have windows 10 on your device, it is just waiting to install.
now, i think that once you get that file, that file wont be updated until it is installed... so waiting or not, you are still going to install that copy of the OS. - this is not confirmed information or anything, just a theory i am proposing.