You have to install it in manual way. Place timecyc.dat file in "GTA San Andreas\data" directory and open the particle.txd (in "GTA San Andreas\models" directory) with TXD Workshop
and replace the coronamoon with the provided one. Of course, don't forget to make backup of the original files before replacing over them.
You may open a new thread
in the help
section for the problems that is unrelated to this mod.