Found that solution but it seem to have some delay to prompt for patient page to alert user the download progress. downloading 28MB file took around 16 minutes.
in ICAP you usually turn off progress indication methods on the ICAP server (MWG) and the ICAP client (BC) has to take care for "keeping the client" busy. Depending on the file it might be possible that MWG took 16 minutes to filter. The other option is that there is a problem with the configuration causing this behaviour. In case you need assistance you should provide more details on your BC/MWG setup and especially name the files you tried to download.