Navigate to UiPath
There you would see Trial expired. In 1-2 day you would see a button on same page to activate trial.
Use your company email id to request for trial again
Sorry but I don’t have exact screenshot but you will get it once you navigate to webpage.
If you don’t have other mail id to activate trial you can always use Community edition. For that use this thread - How to activate Community Edition after Pro Trial duration is over? - #6 by lrtetala
Thanks,
Ashok 
ashokkarale