Why do I have to buy a monthly subscription if I purchased the software? I only need to PDF document

I bought a few years ago the Adobe Photoshop Elements 9.  I thought I was going to spend more time editing my pictures but I never did.  Last year or so, an Adobe rep helped me to create a pdf file, but in doing so she asked me to uninstall the version in my computer and then she asked me to install a new version from Adobe which indicated free trial.  I then got a message last month that the use terms were changing and it was going to be cancelled.  I thought I could install my own program, but it is now allowing me now.  It keeps asking me to buy a monthly subscription.  I only want to change the document I have into a pdf file so that I can send it to everyone in my family.  I rarely use the program, so why do I need to buy a subscription when I paid several hundred dollars for the program itself.  Could you helop me please_