|James Cameron Scriptwright||
Is there a way to update the scripts you have installed?
|Henrik N Admin||
If a script is installed with the same @name and @namespace as one you have already installed, it will be updated. So just install a script again to update it.
There is some code (this, I think) to put in a script to have it check with Userscripts.org for updates every now and then, but no built-in support.