Unity Mono AddIn searches for fixed paths for local documentation and uses it online if it is not found there. A standard installation obviously uses slightly different paths. To fix this for many cases, you can create the following symbolic links (like admin).
For Mac, create:
for name in $(ls /Applications/Unity/Documentation/en/); do ln -s /Applications/Unity/Documentation/en/$name/ /Applications/Unity/Documentation/$name; done
On Windows use:
mkdir "c:\Program Files\Unity\Editor\Data\Documentation\Documentation" mklink /D "c:\Program Files\Unity\Editor\Data\Documentation\Documentation\ScriptReference" "c:\Program Files\Unity\Editor\Data\Documentation\en\ScriptReference\" ...
Good effect: documentation of type Unity opens faster, and is also disconnected from Mono via standard ctrl + 'in many cases, especially if you mark the full type. Unfortunately, it still applies to the online version, if the search function is necessary in cases where there is no direct hit.
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