this is a soon-to-be complete archive of thelonghornproject on archive.org. archived cuz well archive.org is ass with download speeds.
all longhorn versions have timebombs plus product keys

to find them visit:
https://osesbeta.fandom.com/wiki/Windows:Longhorn#:~:text=NT%20Custom%20Kernel.-,Milestone%201,-3551.Lab01_N(storbuild

from the archive.org page:

A large collection of Windows Longhorn builds - both pre and post-reset.
[the archive page is] Currently incomplete - post-reset and most checked builds yet to be added
Recently added builds:
More builds will be added soon

Pre-reset ISOs are named "Windows Longhorn build xxxx"
Post-reset ISOs are named "Windows Vista build xxxx"

Notes:
- Where there is another known compile of a build with the same number, unleaked AND leaked (eg 4015), the lab (eg main) will be put in brackets. If there are two builds from the same lab with the same build number, but a different compile date, the whole build string will be in brackets.
- Builds marked IA-64 are only usable on real Itanium machines with the IA-64 architecture; you cannot use them in a virtual machine and need a real IA-64 machine (which are somewhat expensive!). The following builds are IA-64 only: 4033 (idx01), 4067 (idx01). A BetaArchive user has posted some screenshots of these builds.

- For completeness, all the checked/debug (chk) versions of these builds are archived here as well. The WinPE of builds 4084 and 4088 has also been added.

- Builds 4011 and 4048 are available in their modded I386 repack versions as the original ISOs are broken.

- The server versions of builds 5212-5356 can be installed by typing in a server product key at the product key screen.

- Some builds are buggy, broken or the ISOs are not bootable - don't make a 1 star review and complain, they're beta builds from one of the more unstable development cycles of Windows, of course they're going to be buggy