I purchased lightroom over a year ago and originally set it up and it worked. I don't use it very often and discovered that over 6 months after my last use the program didn't work. It seems i was logged on to the trial version and it was saying my free trial has run out. I have now lost the original card with the serial number on it and have no way of using lightroom. Can you help me please.
You need to state what version NUMBER of Lightroom you have.
Most likely, you need to enter your serial number into Lightroom, but if you have the Creative Cloud version, you'd need to sign in to your Creative Cloud account.