Downloading software over dial-up speeds of 14.4 kbps to 28.8 kbps sucked, and most businesses weren't large enterprises so didn't have T1s (which were themselves only 1.5 Mbps) so sending the office manager across town to Circuit City to buy a boxed copy of some piece of software made sense. The app stores of the 90s were "third party" and physical and covered the needs and capabilities of 90s companies. The other "app store" was even more indirect, software makers paying PC sellers to pre-install.