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problem with installing office

Hi

I have UTM 9 in my company and when I try to install office it stuck in 3% as it shows in the attached image, the thing is when I add the device's IP to 

( Definitions & users > Network Definitions > Exception ) it works fine, I want to allow the whole network to be able to install office without doing the procedure I mentioned before.

I tried everything with Firewall rule and Application control rule but it didn't work, so what can i do??