Both...
Well, as far as I can tell, "Viveport" installed. The attempt to update on the last patch failed and froze up at about 173mb downloaded, however, I'm not overly concerned with having the Viveport application running until after I ever get the hardware installed.
The ViveportCosmosEInstall.exe, that can't complete a 627.5mb download. Somehow, during one attempt, made it to the next step, Headset display port and usb detected, controllers paired, room setup in SteamVR complete. Then during the last set of setup it would eventually freeze with the progress bar at 95% and "more than 60 minutes remaining".
At one point, the light on the headset did turn green with SteamVR running, still a black screen on the headset, and ViveConsole throwing the "oopps" 205 error code.
Even after freezing, that part of the install that tries to download about 1400mb in the background while checking hardware connections, would eventually just stop all network activity, still frozen, nothing after restarting tje computer. Restarting setup would just result in the same behaviour.
After following customer support in "uninstall, delete all temp files, start over" I'm back to being stuck attemping to get the 627.5mb download after first running the ViveCosmosESetup.exe. Then crashing, stalling out, or, if it does reach 627.5mb completion... It will just start over at 0mb without restarting the exe.
IF it reaches 627.5mb, usually it goes up, then drops a few hundred MB, then crawls back up.
Yes, its that ... Problematic,