Nonsense.
1) asp.net application won't download at all at client side (unless you use some extra plugins), since they run on server side
2) you can not install something to run on client side unless it is there to run, unless you use some
virtualization[
^] like
APP-V[
^].
3) a download takes as long as it takes; but if you can afford partial download (rarely used parts of the application are downloaded on demand or delayed) than it might look shorter. This however won't work for a single-package 4GB exe