Need tar "delta-gentools" for BC660K for DFOTA implementation


I’ve checked about the DFOTA for BC660K in the pdf file located at the SDK: DFOTA Application Note.
It states that we must send the new firmware versions to Quectel, then the Delta is generated and sent it back.

But, checking at the forum here, other modules comes with the delta-gentools in the SDK.

I wonder where can I find it for BC660K?

Thank you.