In addition to the other suggestions you've gotten you should also be
able to open up the Finale file from your CD, make whatever changes
you want, and then do a Save As to save a new copy of the file to
your hard drive.
Read Only doesn't usually mean that you can't open the file and
modify it; it just means that you can't save those changes back to
the original file. But there's nothing to stop you from saving the
modified file somewhere else.
Aaron.
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