[SOLVED] Install particular (old) demo-site version

was looking for the right composer command to install a particular (old) demo-site for comparison. Maybe obvious, but for others helpful: (in install documentation off topic and here google will find easier as in slack)

for Neos version 2.3.9 in subfolder neos-demo-239 use:

composer.phar create-project neos/neos-base-distribution neos-demo-239 2.3.9