I purchased Nitro Pro 12 some years ago. It is mine forever, or at least until operating systems change to make an upgrade essential. Now I am informed my "trial" period is over and I must pay for an upgrade to version 14. Version 12 no longer allows me to create new PDFs. This is software I paid for and expect it to continue working. There is no way to contact Nitro Pro to complain about this and using the community support has gotten me nowhere. My serial number for version 12 has disappeared from the "About" button so I cannot raise a complaint directly.
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