С помощью программы IMGTool 2.0 или Crazy IMG Editor импортируйте файлы из папки "Импортировать в IMG"
файл(ы) ash1_hi.dff, ash_po.dff, aw_streettree1.dff, aw_streettree2.dff, aw_streettree3.dff, badlands.txd, bg_fir_dead.dff, ceasertree01_lvs.dff, cedar1_hi.dff, cedar1_po.dff, cedar2_hi.dff, cedar2_po.dff, cedar3_hi.dff, cedar3_po.dff, countrys_5.col, countryw_1.col, countryw_8.col, cs_landbit_43.dff, cuntwland17_de.dff, elmdead_hi.dff, elmdead_po.dff, elmred_hi.dff, elmred_hism.dff, elmsparse_hi.dff, elmsparse_hism.dff, elmtreegrn2_hi.dff, elmtreegrn2_po.dff, elmtreegrn_hi.dff, elmtreegrn_hism.dff, elmtreegrn_po.dff, elmwee_hi.dff, elmwee_hism.dff, firtree2.dff, genveg_bush01.dff, genveg_bush07.dff, genveg_bush08.dff, genveg_bush09.dff, genveg_bush10.dff, genveg_bush12.dff, genveg_bush13.dff, genveg_bush19.dff, genveg_tallgrass04.dff, genveg_tallgrass12.dff, gta_deserttrees.txd, gta_potplantsaa.txd, gta_proc_bush.txd, gta_proc_ferns.txd, gta_proc_grassland.txd, gta_procdesert.txd, gta_tree_bevhills.txd, gta_tree_boak.txd, gta_tree_oldpine.txd, gta_tree_palm.txd, gta_tree_pine.txd, gta_tree_pineprc.txd, gtatreesh.txd, gtatreesh04.txd, gtatreeshi7.txd, gtatreeshi9.txd, gtatreeshifir.txd, hashburytree4sfs.dff, hazeltall_hi.dff, hazelweetree_hi.dff, locust_hi.dff, lod_redwoodgrp.dff, lod_vbg_fir_co.dff, new_bushsm.dff, new_bushtest.dff, pinebg_hi.dff, pinebg_hism.dff, pinebg_po.dff, pinetree01.dff, pinetree02.dff, pinetree03.dff, pinetree04.dff, pinetree05.dff, pinetree06.dff, pinetree07.dff, pinetree08.dff, procobj.col, sand_josh1.dff, sand_josh2.dff, sfe_6.col, sfn_1.col, sfn_2.col, sfs_1.col, sfs_4.col, sfs_5.col, sfs_6.col, sfs_7.col, sfse_10.col, sfse_12.col, sfse_13.col, sfse_15.col, sfse_16.col, sfse_17.col, sfse_7.col, sfse_9.col, sfw_6.col, sjmpalm.dff, sjmpalmbig.dff, sjmpalmbigpv.dff, sjmpalmtall.dff, sm_bevhiltree.dff, sm_bevhiltreepv.dff, sm_bush_large_1.dff, sm_bushvbig.dff, sm_bushytree.dff, sm_des_josh_lrg1.dff, sm_des_josh_lrg2.dff, sm_des_josh_sm2.dff, sm_des_josh_sml1.dff, sm_fir_.dff, sm_fir_copse1.dff, sm_fir_copse2.dff, sm_fir_scabg.dff, sm_fir_scabt.dff, sm_fir_tall.dff, sm_fir_tallgroup.dff, sm_firtallded.dff, sm_firtbshg.dff, sm_redwood_.dff, sm_redwoodgrp.dff, sm_veg_tree4.dff, sm_veg_tree4_big.dff, sm_veg_tree4_vbig.dff, sm_veg_tree5.dff, sm_veg_tree6.dff, sm_veg_tree7_big.dff, sm_veg_tree7vbig.dff, sm_vegvbbig.dff,sm_vegvbbigbrn.dff, sprucetree_hi.dff, tree1.txd, tree1prc.txd, tree2.txd, tree2prc.txd, tree3.txd, tree3prc.txd, tree_hipoly04.dff,tree_hipoly06.dff, tree_hipoly07.dff, tree_hipoly08.dff, tree_hipoly09.dff, tree_hipoly09b.dff, tree_hipoly10.dff, tree_hipoly11.dff,tree_hipoly14.dff, tree_hipoly19.dff, vbg_fir_copse.dff, veg_bevtree1.dff, veg_bevtree2.dff, veg_bevtree3.dff, veg_largefurs01.dff,veg_largefurs02.dff, veg_largefurs03.dff, veg_largefurs05.dff, veg_largefurs06.dff, veg_largefurs07.dff, veg_palm01.dff,veg_palm02.dff, veg_palm03.dff, veg_palm04.dff,veg_palmbig14.dff,veg_palmkb1.dff, veg_palmkb13.dff, veg_palmkb5.dff,veg_palmkb7.dff, veg_palmkbb11.dff, veg_palwee01.dff, veg_palwee02.dff,veg_pflowers03.dff, veg_pflowers04.dff, veg_tree3.dff, veg_treea1.dff, veg_treea3.dff,veg_treeb1.dff, vegepart.col, vegtresshi9b.txd,vgs_palm01.dff, vgs_palm03.dff, vgs_palm04.dff, vgs_palmvtall.dff, vgsn_nitree.txd, vgsn_nitree_b01.dff, vgsn_nitree_r01.dff, vgsn_nitree_y01.dff в архив C:\Program Files\Grand Theft Auto - San Andreasmodels\gta3.img;

Все содержимое папки "Скопировать в папку" скопируйте в папку с игрой подтвердив замену. Если хотите иметь возможность удалить модификацию, то не забудьте сохранить в надежное место оригинальные копии заменяемых файлов.