I have JIRA v6.3.4#6332-sha1:51bc225
Trying to install latest "SharePoint Connector for Confluence"
Could not find a handler capable of installing the add-on at SharePointConnector-1.9.0(1).zip. Check that the file is a valid add-on.
No errors in catalina and atlassian logs
Oh, hang on, I'm really sorry, I've made a mistake.
I forgot that the sharepoint connector is a bundle, NOT a plugin. What you need to do is take the download .zip file and unpack it. You'll find it contains directories with assorted files in them - you need to try installing the plugins from the "confluence plugins" directory.
My guess is that you've downloaded the Confluence plugins using Internet Explorer and you've run into the bug that it stupidly and pointlessly renames some files when you download them.
You could try downloading with a proper browser, or try renaming the .zip to the .jar file it should be
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