That message is indicative of trying to open a file created in a later version of InDesign.
If you're using CS4, you probably have to contact the creator of the plug-in. Assuming, of course, they're still around and still support CS4.
If you're using Creative Cloud, there's a new location for (at least some plug-ins and add-ons):
Window > Browse Add-ons in InDesign CC versions.
The file was created in my CS4 version then manipulated by someone who had CS5. I know this - but the prompt suggests that I should be able to upgrade my plugins. I just don't know where to do this.
After reading what happened, I'm now inclined to what Bob said: The person who has CS5 will have to save the file as IDML (File > Save As > InDesign CS4 or later (IDML)). Then you would be able to open it in CS4.
Adobe does not provide backward compatibility of INDD files. When you open a file, that has been saved under a newer version of InDesign, you need to create in that newer version an exchange file in a format called IDML. IDML files are compatible with Indesign starting at version CS4.
The message you get is irritating because it talks about plugins that need to be upgraded. This is completly nonsense. Plugins of your CS4 Indesign do not expire. The message also states, that the file has been created/saved under a newer version of Indesign. This is the message to retain.
You will however getting this message more often when exchanging data with other Indesign users as less users use an old version of Indesign. That was for us the reason to upgrade our CS5 installations to CC2015. An other reason will be, that you may experience problems with your OS when acquiring new computer hardware. The latest OS versions are not supported for your version of Indesign. They may or may not work.
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And there is an ExtendScript script by Jongware that you can use with InDesign CS4 and above to get more information about the version of an InDesign document in case the origin is unknown or the creator cannot be reached:
The message is not completely nonsense, InDesign and InCopy are primarily not programs, but PlugIn Manager with layout functionality. That is why this message is correct, only difficult to understand.
Expect unwanted changes if you use IDML as intermediate file type! Better would be to work all on the same version.
The simplest solution would be to download the trial of InDesign CC - trials last 7 days (or something ridiculously short)
From InDesign CC you can export the file to IDML and open in CS4.
If you need to do this after your trial expires you pay a 1 off fee to use InDesign CC for 1 month which is about €25 a month. It's a one off fee.
Willi Adelberger wrote:
The message is not completely nonsense, InDesign and InCopy are primarily not programs, but PlugIn Manager with layout functionality.
Yes, and Windows and OSX are plug-in manager too... And Indesign is a plug-in...