Ok I'll try redownloading the 2nd and 3rd part (the place where the install fails lands in that grey area where your not sure which one it would be) but ive checked and the download when it actually begins is a different size from the one listed here and on the site.
Here its listed as 207,872mbs but when 1 actually begins downloading my download browsers lists it as only 198 and change so Im not completly sure if Im still downloading a bad file again