unauthorizing a PC

I am using beersmith at home and work.  Next week my work PC is getting changed out and I want to put beersmith on the new one.  I do not see any way to deauthorize (unauthorize?) the old machine to stay in the 2 pc limit.  Is there a way to do this or does it matter? Thanks.

Hi,
  Just uninstall it once you are done copying your data over.

Brad