Have you already wiped the drive you are installing to? If so, then no, there is no way to avoid having to re-download the updates. If you have not wiped it (check the drive to see if there the previous
Windows directory has been renamed as a backup), then you can probably avoid re-downloading a lot of it.
C:\Windows with the path to your old Windows directory).
You will find a bunch of files with a long alphanumeric name and no extension. These are the updates (and miscellaneous files). What you need to do is to figure out which ones are executable and run them. You could try using a hex-editor or something to open and view them, but it is much easier to just rename them.
First make sure that extensions are shown (Tools->Folder Options->View->de-select Hide extensions for known file types). Now for each file in the
Download directory, rename it, adding
.EXE to the end and then run it. (Consider creating a temporary folder to move them into after running them to make it easier to keep track of your progress.)
You will likely find that some of them crash and give an error message. Don’t worry about this since not all of the files in there are actually executable files, some are text files containing licences agreements, etc.
Once you have run all of the updates, reboot the system and run Windows Update again. You should find that fewer (if any?) updates are listed (it depends on how many were still in the