none of the DJ platforms allow you to record streaming tracks. It's a legality agreement with the music providers and the Digital DJ companies.

you can always use an external mixer or the "rec out" on your primary mixer... plug the audio output into a recording device input like another computer that has a recording app running, an iPad or iPhone, or a dedicated recording device like a Tascam or a Zoom.

You can use a program like "audio hijack" by Rogue Amoeba, "Audacity", The voice recorder app on an iOS device.

some of the digital recording apps can pick up the output audio from Serato and record it on the same computer you are actively using, but I wouldn't recommend running a recording app in the background while you're using Serato.... it could cause reliability issues....

if you're gonna record on the same computer while you're djaying....I'd at least to a lot of reliability testing before you gig with that setup.

Thank u ! 👍

"Loopback" by Rogue Amoeba is the solution

👍👍