Rafi,
first of all, you can use a proxy server for updating and even start a servoy application-server, just add two (or more options) to your servoy_server bat or sh file (ask the IT department what the proxy host & port is)
java -Dhttp.proxyHost=x.x.x.x -Dhttp.proxyPort=xxxx (and here follows the rest of the commandline)
What happens if you do that??
2. you have asked this multiple times, look here: viewtopic.php?f=16&t=18446&p=100588&hilit=proxy+bat#p100579
and the answer is still: No!
for the rest, the whole story is very contradictory. Are you sure the popup you see (even with the demo server of servoy) isn't just a java popup asking credentials for a proxy??
It looks like this client, has a very strict network, and you are struggling with IT & network stuff here. (That's a whole different ballgame, than being a developer, trust me! )