The download file is 3GB if you have slow internet it takes awhile.

Next thing is W10 is 'free'  wrong... it does a massive snoopfest and reports back to mother MS on what it considers important. Similar to what android has been doing all along.

You can turn some of this snooping off by clicking on custom install during the installation process. 

 
I had one issue with a home built machine that had a partition drive too small for the install, 2 min fix

MS Edge is the new internet explorer and Dish network hopper slingshot is not yet compatible, but the default warning prompts you with a Mozilla firefox or older IE 11 download fix.  

Anyways enjoy a robust OS that is speedy compared to W7 as well.