Deleting local license info is only doing part of the job - you’ll be able to register new license, but old one is still used (as far as license checks are considered).
Depending on your used version it might vary a little bit, but take a look here for starters:
If not sufficient, search for topics about license, unregister, deactivate etc. - sometimes you need to use some Google-fu like abilities 
Lastly, if you can’t find a dependable solution on your own (or you’re unsure if a particular license has been correctly unregistered), contact UiPath support - keeping licenses correctly assigned is in their benefit as well as it prevents “but we had licenses left!” complaints in the future.
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