What errors are you getting? I have not tried it personally, but the author of Add-on Install & Upgrade suggested it was fixed in the last release of his mod. Otherwise, just use the standard "Install Add-on" option and perform the manual steps of uploading, etc.
EDIT: This was the post I was talking about:
https://xenforo.com/community/threads/add-on-install-upgrade.35211/page-38#post-849548
It seems that it was stated to be fixed in the next release on Nov 2, 2014, but the last release of Add-on Install & Upgrade was Sep 29, 2014. So this issue is not fixed yet. You should use the standard "Install Add-on" procedures, which are also outlined in the VaultWiki Install Manual.