Computer got damaged by water. Moved Hard drive to replacement identical computer. Now Acrobat DC asked user to re sign in and started a 30 day trial. How come the license got rmoved or reset?

I have a PC that got damaged by water.  Was able to remove the hard drive and put in a replacement computer that was the same make and model has the original pc. the user went to use fully licensed version of Acrobat DC that was installed on hard drive.  It asked user to Sign into Adobe.  and the software started a 30 day trial.  How come the licensed got removed or is unable to be recognized?  Is there a way to fix this??