Hi Rafael,
Regarding RV042 we cannot block the https traffic , you can ask for other model such a ISA550 or ISA570 Firewall router which they have a security service and you can able to block https traffic also you can block by categories ....
Here is the link for Emulator (please open it with IE or Firefox):
https://www.cisco.com/assets/sol/sb/ISA500_Emulators/ISA500_Emulator_v1.1.13-1.2.1/index.htm
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Regards
Mehdi