i'm completely stranded.help!!!!!

Directly onto the point,my problem is that i have a very slow internet connection so it took me a day to get the engine downloaded to 69% or so but then i saw version was changed from 4.8.0 to 4.8.1, and the download started from 0%.The downloaded content is still there in the folder.

I don’t know what to do anymore.

You will have to wait for 4.8.1 to download. This is a hotfix for 4.8.0.