Ever since you replaced the ED5 toolbar with the SI Toolbar, I have noticed that the Joomla update notification shows there is an update, but when you then want to make it happen, it fails.
The only way to update the SI Toolbar is from the Apps section for EasySocial and then manually update it on the Joomla admin side.
This is not only clumsy, it also does not look good that it fails and it is not that easy to find the SI Toolbar app when you are only used to the ED5 side of things.
Hope you can improve this soon.