My Adobe Acrobat Pro DC app I own says I am not licensed to use any features

My application opens and allows me to open, view and print .pdf's but no longer allows me to edit or use any of the advanced features.  I have my key but cannot figure out how to re-register it.  I attempted an uninstall/reinstall where it allowed me to use during the "trial" period but never asked me to register, it simply reverted back to where it states "This feature is not included in your current Acrobat license" when I attempt to edit or use any of the advanced features.  I am using this for a project at school and am under a tight deadline.  Any assistance would be greatly appreciated!

Regards,

M