Mixvibes Dj Community old forum

I have a question please, I have a license Cross and Cross DJ in 3.4.3, I saw that it has Cross DJ 4 and Cross DJ pro which is out, must I achede again the es license or what I have is good, because I did not know what the differences between the software is if it has big change. I also have an iPad Pro with Cross DJ pro, there is you possibility to have a mapping to connect iPad Pro with the Ddj SR with the software Cross DJ pro