Map mods usually have the folder "data/maps/leveldes/" and the files seabed.ipl and seabed.ide
Just drag and drop these files into your GTA San Andreas folder(data/maps/leveldes/)
REMENBER TO BACKUP
And now the gta3.img , where we will add the map files , just open gta3.img with Alci's Editor and import the map files into it , for example i'm installing Luigi's Road and these are the file names!
luigi.txd
luigi.dff
luigi.col
And that's it , save gta3.img and play the game!
Here is an example of a map i installed using the method above!
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