I had to un-install FSLSpotlights. I originally purchased it, how do I get the lisence version again ?

It should be in your emails...

It look's like I accendently deleted the serial key in my e-mail. Is there an account I can log into to retrieve it ?

Send support an email (support (at) flightsimlabs (dot) com) with your order ID and they'll help you out.

Isen't my order ID lost with the e-mail holding the key ?

I just found the answer to my question. After my re-install of the trial verson. I clicked on " help ", then " registration " The pop up shows my original serial key already there. It never was lost.

Thanks again for a wonderful product.

It's not lost, it's saved in the registry. Glad you were able to restore it!