Ok time for specifics, no more hand grenades and horseshoes. The add-ons that we use are as follows:
Certificate, Questionnaire, Configurable Reports, ILP, Navigation Buttons, OneTopic format, and the Face to Face add-on.
We also use ELIS and a custom theme. Thank you for your help in getting a hack more informed.
That is not very specific. Which one of those plug-ins gives you the error about there not being a 2.3 stable branch when you try to install it?
My apologies. The one that I have tried to install is the Navigation Buttons. I wanted to successfully install one before moving on to the rest.
So, look at https://github.com/davosmith/moodle-navbuttons. You will see that there is only a master branch and a MOODLE_19_STABLE branch, so presumably you need to install the master branch if you are any Moodle 2.x. The readme file there confirms that hypothesis, although it could be more explicity.
So, just do a git clone of that repository.