The full download has been available here since the release. If you're getting an NSIS error, delete the partial file in your downloads folder, clear your cache out and try to download it again. If it gets cut off early again, contact your ISP. We had a couple specific ISPs who had this issue where they cut off communication with our servers (at the release of 12.6), but everyone who contacted their ISP managed to get it downloaded shortly after.
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