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Is there a way to get TeX Live in a .iso or .exe file with all required files and packages instead of downloading the net downloader/installer?
I would download TeX Live just one time, and install it where I need without waiting every time long hours for the download. Also if the TeX Live version couldn't be the last; one time that I have installed I can update it with the TeX Live Manager...
TeX Live is available as "one huge ISO file" from the TUG website Acquiring TeX Live as an ISO image. It is also available in a number of smaller, yet still big tarballs. It is also available as a .torrent.
Both these methods have a fixed image available for download, so packages may have been updated after the official release and therefore still require packages to be updated after installation.
texlive2012-20120701.iso and this other texlive2012.iso?
tlmgr will give you the most up-to-date packages from the downloaded repository. I doubt there's a difference in the .iso releases. The release date for TeX Live 2012 was July 8, 2012, after which the DVD, ISO, TARball and Torrent files should be fixed. Since I downloaded TL 2012 via the net installer, I don't know much more.