Read Title (sorry for bad grammar, couldnt fit)
according to this valve dev website, it can be downloaded via SteamCMD, or anonymous login, yet its not working!!?
If SteamCMD is returning an error stating No Subscription, this is because the account you are using does not have a subscription to Garry's Mod.
The GMOD Dev website says that it can be downloaded over the anonymous account, so it would appear that you are not logged in. Ensure that you have typed:
If this still returns No Subscription, you will have to login with a Steam account that owns Garry's Mod. You can log into your own account by typing login [your steamID].
login [your steamID]
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