: You receive security patches and bug fixes until the product reaches its end-of-life.
Unlike the current which requires a monthly fee, Acrobat Pro 2020 was sold as a perpetual license. adobe acrobat pro 2020 serial number best
If you already own the software but lost your key, there are official ways to retrieve it: End of support for Adobe Acrobat 2020 : You receive security patches and bug fixes