So Reader Extending can be done a couple ways but I caution how you plan
to use them. Adobe has agreements on what can be extended and then
distributed. You should reference their licenses or call them. In any
case for a single form you can do this with The full version of Adobe
Acrobat (I am using Acrobat XI). Open the form, Select File -> Save as
Other -> Reader Extended PDF -> Enable More tools. Once you do that,
close the form and try opening it in Reader. You should now be able to
fill in, ...