If DNS is working, you should try to check if you can reach port 80 which is used for package install:
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# nc -vz 188.165.99.10 443
Connection to 188.165.99.10 port 80 [tcp/http] succeeded!
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# nc -vz 188.165.99.10 443
Connection to 188.165.99.10 port 80 [tcp/http] succeeded!
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root@pfsense:~# curl https://dynfi.com/files/connection-agent/pfsense/dfconag-latest-installer.sh --output /tmp/dfconag-installer.sh && sh /tmp/dfconag-installer.sh