This mod is to make the summoned creature last longer, it is not a permanent solution to the problem and the reasons for this are explained in the included file. It is a temporary solution to the problem and it is not permanent. The best way to fix the problem is to get rid of the summoned creature when it dies.

You need to download the file, which is a ZIP archive, to install and activate the mod. Once done, you can go ahead and enjoy your newly-modded game.