I use XMPie with CS6 for variable data projects. Unfortunatly it is not yet available for CS7. The problem arises when I go to package the project at closing. If I began the project is CS6 and updated it to CS7 (or sometimes when it was originally produced in CS7) it will not allow me to package it saying I need to have the plugin installed. How can I fix this?
If you're workflow requires XMPie, and they haven't yet produced a plugin for InDesign CC (it's really not CS7...if you see that name, it's because the name switch happened soon before release), then you should save the file as IDML. Then reopen the file in InDesign CS6. Check it over carefully then use your plugin in CS6.
Running through .idml should strip out the XMPie plugin info and allow you to package from CC, as well, if you haven't actually used the plugin. Obvioously, if you need to use the plugin, then Steve's route is the only way, but you should be prepared for some potential reflow issues.