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could you run a test on one of the InDesign documents and verify the exact version it was created from?
See the ExtendScipt script IDentify.jsx by Jongware to do this:
How to install it?
Download the zip file that Jongware linked to.
And follow the steps to move the jsx file to the right folder in your system.
Then the script is immediately available in your Scripts panel.
If it's installed double click it from InDesign's Scripts panel.
You will be prompted to navigate to the document you want to test.
Select an InDesign document and say OK.
An alert will inform you what the script found. Here an example for a document saved with InDesign CS6 version 8.1
The alert says CS6.1. And it also says that I can open this document. I ran the script with InDesign CC 2017.
For documents last saved with CC versions of InDesign you have to interpret the result a bit.
This is showing that the document was saved with InDesign CC 2015.3:
At the time Jongware wrote the script InDesign CC version 9 was released and nobody knew how the next versions following would be named. So the naming scheme of the script is a bit odd:
CC is CC 9.0
CC.1 is CC 9.1
CC.2 is CC 9.2
CC.3 is CC 9.3
CC.next is CC 2014 version 10.0
CC.next.next.3 is CC 2015.3 version 11.3
CC.next.next.next is CC 2017 version 12.0
In your case the result could be
CS5.5 that is version 7.5
which is not CS5, that would be 7.0
CS5 and CS5.5 are totally different versions of InDesign.
You cannot open CS5.5 documents with CS5.
Wheras you could open CC 2015.4 documents with CC 2015.1.
Or you can open CC 2014.2 documents with CC 2014.1 or CC 2014.
That's the big difference to CS5 vs CS5.5.
Ah. Please come back here if you tried and tell what the alert is saying.
Best log in to the forum and post a screenshot of the alert. You can do this using the forum's tools:
Thank you. The files I'm trying to open were created in CS5.5 which is what was previously installed on my old computer, as I had no problem sharing files between the two programs. I do believe I received an update from the original CS5 program, but I don't see that on the Adobe site anywhere.
It looks like I'm running CS5 version 7.0.4 now.
I saved the file (in CS5.5) as idml, but receive the same messages about missing plug ins when I try to open in CS5. Thank you though.
That generally indicates that all you did was change the file extension. Not the same as exporting.
Thanks Bob. Working on that now.
Thank you Bob.All's well.
I have the same problem. Few years ago i had to delete everything on my mac including older versions of Adobe CS. Installed CS5.5 again, the latest version i had bought. After that I can't open IDML or normal 5.5 files in Indesign. When i open it just spinning, and indesign is crashing. I recieved the same message about missing plug ins or updating plug ins. Did update everything but still have the problem : / what to do?
Your current OS?
OS X El Capitain - 10.11.6
CS5.5 is not supported under 10.11 or later. Someone might have a suggestion to help but it’s important to understand that you might never get it to work satisfactorily.