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You can still install Steam offline, by using the method suggested below.
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That is provided your Steam client has been authenticated and that you’ve logged in to your Steam account for at least once, which requires internet access. This should not be confused with Steam offline installation. However, Steam itself when installed, can go offline. So, there is no way to install Steam offline without connecting to the internet for at least once. It needs to authenticate your PC with its server when you first launch Steam on a new computer. Steam is an online gaming platform and is meant to be that way. Well, the fact is, no, you cannot install Steam offline.
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