Unable to open pdfs after downgrade from PS  CC 2014

Greetings.
Our office has several seats of Creative Cloud, and our workstations are all Macs. 
When InDesign and Photoshop upgrades to version 2014 were released, I installed them on our computers; only to discover that the upgrade is not compatible with OS X 10.6, so I had to downgrade - InDesign docs created in 2014 are not readable by InDesign CC.
Anyway, since then, I have one user who has followed the same procedure for some time, to create a pdf, which is as follows:
- Open an AutoCAD dwg file in AutoCAD (in Windows), and save as a PDF 'Drawing 1.pdf'
- Open PDF 'Drawing1.pdf' in Photoshop CC (in OS X 10.8.5)
- Add Layers, and add information (colouring in)
- Save PDF as a new PDF 'Drawing 2.pdf', saving the created Layers.
- Open PDF in Adobe Reader to print the PDF.
This used to work fine, however now the PDFs that have been modified will not open - claiming they are corrupt either with the error message: 'This is not a valid Portable Document File (PDF) document. It cannot be opened.' or 'Adobe Reader could not open 'Drawing2.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded).'
Of course this means that all the work done has been lost, as the file was closed after saving.
I am not sure if the downgrade is the cause, but this is the only thing that has changed since the issue appeared.
The user has an iMac running 10.8.5.
Any help with this would be appreciated!
Cheers,
m

Hi MBP User,
Are you still facing this issue?
Have you tried to uninstall and reinstall. Is this issue reproducible on other machines, if you have around you.
Regards,
Ajlan Huda.

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