the tarballs haven't moved.  that bucket has all the latest.

i've updated the docs to deal with gitiles and with the bzip2->xz change.

vapier@chromium.org : no the command line in https://www.chromium.org/chromium-os/developer-guide/using-sdk-standalone still doesn’t work. I have a 404 error, even with the update.

localhost /tmp % eval $(curl -s https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/chromeos/binhost/host/sdk_version.conf?format=TEXT | base64 -d | grep '^SDK_LATEST_VERSION=')
wget "https://commondatastorage.googleapis.com/chromiumos-sdk/cros-sdk-${SDK_LATEST_VERSION}.tar.xz"
https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/chromeos/binhost/host/sdk_version.conf?format=TEXT
--2016-11-30 17:48:18--  https://commondatastorage.googleapis.com/chromiumos-sdk/cros-sdk-.tar.xz
Résolution de commondatastorage.googleapis.com (commondatastorage.googleapis.com)… 2a00:1450:4007:809::2010, 216.58.209.240
Connexion à commondatastorage.googleapis.com (commondatastorage.googleapis.com)|2a00:1450:4007:809::2010|:443… connecté.
requête HTTP transmise, en attente de la réponse… 404 Not Found
2016-11-30 17:48:19 erreur 404 : Not Found.

working fine for me.  you should verify each step of the way since there's a number of nested commands.

what does curl output ?
what about curl|base64 ?
what about curl|base64|grep ?
what about after the eval ?  is that env var set ?

Ok, I finnally found the issue. The command line given in the documentation is bash specific : it doesn’t work in zsh.

the expectation with pretty much every code snippet in dev.chromium.org is that you're running a POSIX shell (typically, but not always, bash)