I use the Steam version of Kerbal Space Program and I don't know where add-ons have to be installed.
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Where do Kerbal Space Program add-ons have to be placed (with the Steam version)
kerbal-space-programmods
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Best Answer
Once you've downloaded an addon, you have to put the files (unzip them if they come in a .zip archive file) in the GameData folder, for example on Windows 64 bits this is this path:
If you use another OS see the official Wiki to find the root directory of Kerbal Space Program.
Example: I installed the WaypointManager add-on in the GameData directory and the result is a C:\Program Files (x86)\Steam\SteamApps\common\Kerbal Space Program\GameData\WaypointManager dictory containing the add-on files: WaypointManager.cfg, WaypointManager.dll, etc.
Source: Tutorial:Installing Addons (official wiki).