Adobe Reader and Acrobat Professional are 2 different products. Reader is for free and limited as to what it can do an support.
Add-ins can only use features supported by Reader.
You need Acrobat to edit PDF forms. Acrobat no longer supports access to SQL databases through Acrobat JavaScript.
If you have an add-in and Acrobat can use it for filling a PDF form from Access, you need to talk to the developer to see if it can work with Reader.