Help please

Hello my name is Cosmin and I have a problem. Last year I bought a SilverCrest mixer DJ 2.0.2 and Cross Them I had no problems with it just like now I have lost the CD Key of the software you have installed on your computer just as I appeared to put again the license but I lost it through the House and not find it. What can I do? I need I miss to use it. A good day. 
I'm from Romania this mixer I bought from Lidl. (I use bing translate)

I'm from Romania this mixer I bought from Lidl. (I use bing translate)