InstallAware

how does installaware handle firewalls that do not allow exe or cab files to pass through? Aretheir features to make web based installation in highly secure environments easy and realiable?

There are lots of things you can try. For instance:

a) The default file extension for web download segments is 7zip, not EXE or CAB. That should already help.
b) You can use any file extension in your web download segments.
c) You may refer to URLs inside your corporate firewall for the web download segments. This would add the additional protection of rendering your internal setups completely useless outside of your firewall!
d) You may pre-cache all required files on a network path inside your firewall. This way InstallAware will not even attempt an external connection, as it will find everything it needs in that one cached place.