As per the license you can distribute the FULL installation executable for your clients to install FL Lite on their machines but you can't distribute the the separate binaries (e.g. EXE, DLLs) on a CD. For your clients to use FL Lite they must run the installer.
With regard to FL Pro each user of the software must be licensed, ie a license purchased by you does NOT cover anyone else but you. There are options to bulk purchase licenses for your clients and/or develop a tool using the FL Pro run-time but you should contact Sales for more information.