You really can't get a refund on any software that you buy, LFS or other software. This is due to the nature of the consumer good being in digital form and easily copied and returned. LFS is slightly unique with the online unlocking with a password, but you can still unlock then ask for a refund, in which you would still have the unlocked usable copy on your harddrive. So, I'd give the answer a no.
Just curious, mind stating why you would like a refund? I'm being selfish here because we really do need more racers in the US timezones and I'd rather see someone stay than to attempt to "refund" this fantastic sim.