Vista - vista rc1

ok it may be just me
but when i try to download i cant get the download manager to work so i try
the other way 1st time download stoped @1.99gb and then started copying to a
file then opend the iso file with iso buster but cant as it says i need to
regester $30
do not want to do this i see the download should be 4 gb anyone help also is
ther a way once i get the full download that this can be instaled without
having to pay for isobuster as may never use it again