You will never have the latest version as he updates it very frequently. You are better off downloaidng installing it from his gitlab repository directly. He does not use Github.
Here are commands for you to install it. Thanks to pepinoogorino on the PLI forum
Code:
opkg update && opkg install python-html python-textutils
rm -rf /usr/lib/enigma2/python/Plugins/Extensions/IPTVPlayer
wget -O - http://iptvplayer.vline.pl/download/update/latest.pythonX.X.tar.gz | tar xzf - -C /tmp
cp -r /tmp/iptvplayer-for-e2.git/IPTVPlayer /usr/lib/enigma2/python/Plugins/Extensions
rm -r /tmp/iptvplayer-for-e2.git
sync
killall -9 enigma2
A suggestion was made to have an installer script on the plugins menu, it got rejected. Too complicated apparently.