When downloading Paratext 8, I’m told:
The Online file is smaller and may be used if you are installing while connected to the Internet.
The Offline file is larger and must be used when installing while not connected to the Internet. This is the one you would normally download to install on a different computer.
What is the actual difference between the installers? For some offline installers the main (only?) difference is the inclusion of dot net, which is installed on almost all recent Windows computers anyway. I dutifully downloaded the offline installer, since I can’t guarantee an Internet connection for our installs, but I would rather not have to download that extra 85Mb, if I don’t have to.