What kind of plugins are you refering to?
thank you for your help! i have cs4 and i was using the new trial from adobe and it wont let me open any of my old files.
it says upgrade pluggins? to their latest version.
I suspect you are trying to open a file made in a new version of InDesign, using an old version. You cannot. The error message mentions plug-ins. If this does not seem to be the case, please tell us
* the version which made or last edited the INDD file
* your own version
* the exact message in full