Read only error message when trying to save updates in Acrobat 10.6.3

Hello

Hopefully I'm missing something obvious here but when I try to edit a PDF in Acrobat 10.6.3 I receive a read only error message, I have been using 'Save As' and tweaking the name each time but this seems to be a clumsy way to go about a simple save.

I am on a network and have read a previous thread that explained Adobe can sometimes be flakey on networks for saving PDFs.

Any suggestion gratefully received.