I paid for the online pdf convertor, and it worked great, but recently I tried to use it and I recieved a message that said my browser is unsupported. I can't upgrade my browser because I don't have the OS X v10.6. Does this mean I can no longer use the service I paid for?
You could try using Firefox or Chrome on Mac OS 10.5.x instead of Safari. It may work. Mac OS 10.5 is not a supported environment: https://www.acrobat.com/welcome/en/misc/system-requirements.html
Alternatively, you could access the ExportPDF service through Adobe Reader X (not XI) tools pane.
Please let us know if you have any questions, we'll try to help get this working for you!