I have no idea if this may or may not work as I do not use this addon, but the Master Kodi IPTV Simple PVR zip file can be downloaded from here:
https://github.com/kodi-pvr/pvr.iptvsimple/archive/master.zip
It may or may not work when you install it from Kodi > Settings > Addons > Install from zip file
Even if you upgrade to Kodi Isengard you should be able to downgrade again via the script to Kodi Helix if problems are encountered.