The scripts install.bat and install.sh can be configured to download and extract the latest release from multiple repos and extract them to the directory where the install script was executed in without creating a subdir or anything.
For the install.sh file its important to note that it should be executed like ./install.sh and not like sh install.sh as it will return an error otherwise.
This could be used to install "dependencies" or for a plugin system or whatever. You could also modify the script to pass arguments instead of hardcoding the repos.