how much GB is it? i don’t have a very fast internet speed .Hoping it will be within 3 GB. Please answer soon.
7 GB. not including the marketplace content downloads
Very worth it though 
You can resume the download at a later date if you pause it or it stops.
can you resume the download and stop it whenever necessary or do i have to download it all at the same time ?
if my internet connection suddenly fails when download, would i lose the files i already downloaded? Please answer , this is all i need to buy the licence.
If it fails while downloading, you can resume. Oh, and the engine is free now.
my internet connection is so slow i am downloading the launcher(36.2, Mb in case u dont know) from the last 43 minute. XD