There used to be a command something like cl_allowdownload 1. not sure if its supported by ESF or if its the right command. i'll look it up.
cl_allow_download 0 toggles download of maps, models and decals when joining a server - * 1 is 'on', 0 is 'off'
cl_allowdownload 0 toggles download of maps, models and decals when joining a server - * 1 is 'on', 0 is 'off'
cl_download_ingame 0 toggles downloads of models and decals during a game - * 1 is 'on', 0 is 'off'
I dont know if and what command even works in ESF. but you could try these out