Global firmware you can get from international/US D-Link.
But I got mine previously by updating within the router firmware update function (under MANAGEMENT tab).

The 2.07TM can get from D-Link MY/SG site.

The 2.07TM will have something like this displayed in the HOME tab

I don't have a clue what this is, probably someone else can explain.
My DiR-850L originally came with 2.06 which I think has TM firmware, since it was given for UniFi subscription anyway.
Then, I use the built-in firmware update, and the router downloaded 2.07 global. It was running fine, no issues.

Then I gatal tangan and downloaded 2.07TM from D-Link Malaysia site and manually flash it. It was okay for a few days until I found out that it doesn't work well with OpenDNS. Domain blocking still works, but in the same time, you cannot access websites marked 'illegal' by TM.

Then I tried reverting back to Global 2.07 by downloading the firmware from US site and manual flash. Somehow this time I couldn't even connect to the internet for some unknown reason. Your result may vary.

Now I downgraded to 2.06 Malaysia firmware, everything works just the way I like it.

So my recommendation is don't upgrade to 2.07TM unless you are only doing 'normal stuff'