Did you read the manuals for the mixer and players? They don’t need to be on the same sample rate frequency, only your mixer has to be set the same as the software. Set you mixer to 44.1kHz.
Follow this guide: https://support.native-instruments.com/hc/en-us/articles/209576189 If you don’t succed, please give us more info of exactly WHERE are you stuck. Also, make sure you have the 64-bit Denon ASIO driver installed.