Installation (*keep your original files at save place):
1. Copy japan_tree.brf to YourMod\Recource\..
2. Copy textures to YourMod\Textures\..
3. Add to module.ini "load_mod_resource = japan_tree"
4. Copy flora_kinds.txt to YourMod\Data\..
5. Copy particle_systems.txt and scene_props.txt to YourMod\..
6. by Scene Editor on your scene add bamboo_1, bamboo_2, bamboo_3, tree_acer, tree_sakura, fallen_sakura_flowers from the list "Plants" and fall_sakura_flowers from list Scene Props.

PS:
+ for customizing height of tree change z-scaling;
=============================
+ (native) flora_kinds.txt containe next changes:
1. counter value increased by 6 (before 82 -> 88 now);
2. added strings at the end of file:
tree_sakura 17184066572 1
tree_sakura_1 bo_tree_sakura_1
Elysian_Fields GateKeeper
fallen_sakura_flowers 300647713804 1
fallen_sakura_flowers 0
tree_acer 17184066572 1
tree_acer_1 bo_tree_acer_1
Elysian_Fields GateKeeper
bamboo_1 17184066572 1
bamboo_1 bo_bamboo_1
Elysian_Fields GateKeeper
bamboo_2 17184066572 1
bamboo_2 0
Elysian_Fields GateKeeper
bamboo_3 17184066572 1
bamboo_3 0
Elysian_Fields GateKeeper

=============================
+ (native) particle_systems.txt containe next changes:
1. counter value increased by 1 (before 60 -> 61 now);
2. added strings at the end of file:
psys_fall_sakura_flower 258 prt_mesh_fall_sakura_flower 1 9.000000 0.000000 0.025000 4.000000 4.000000
0.000000 1.000000 1.000000 1.000000
0.000000 0.500000 1.000000 0.500000
0.000000 0.500000 1.000000 0.500000
0.000000 0.500000 1.000000 0.500000
0.000000 0.250000 1.000000 0.250000
4.000000 4.000000 4.000000 0.000000 0.010000 -0.900000 0.020000
15.000000 0.000000

=============================
+ (native) scene_props.txt containe next changes:
1. counter value increased by 1 (before 1026 -> 1027 now);
2. added strings at the end of file:
spr_fall_sakura_flowers 0 0 0 0 1
-40.000000 1 1965 1 1008806316530991164

=============================
+ also in zip are present module system files (v1.134), if you like original code:
1. module_particle_systems.py
2. module_scene_props.py