kzblt_zigzaghop

Download map archive kzblt_zigzaghop.zip
Unzip the archive in any convenient folder
Open cstrike folder, which is located in the place of Counter-Strike installation. In case of Steam version the path looks like Steam\steamapps\common\Half-Life
Copy all files from the folder, where you unzipped the archive, to cstrike folder according to the following table (if your system asks about replacing files, choose Copy and Replace):

gfx/detail/dt_brick.tga	>>	mapsgfx/detail/dt_brick.tga
gfx/detail/dt_grass1.tga	>>	mapsgfx/detail/dt_grass1.tga
gfx/detail/dt_ground3.tga	>>	mapsgfx/detail/dt_ground3.tga
gfx/detail/dt_ground4.tga	>>	mapsgfx/detail/dt_ground4.tga
gfx/detail/dt_leather1.tga	>>	mapsgfx/detail/dt_leather1.tga
gfx/detail/dt_metal1.tga	>>	mapsgfx/detail/dt_metal1.tga
gfx/detail/dt_metal2.tga	>>	mapsgfx/detail/dt_metal2.tga
gfx/detail/dt_plaster2.tga	>>	mapsgfx/detail/dt_plaster2.tga
gfx/detail/dt_rock1.tga	>>	mapsgfx/detail/dt_rock1.tga
gfx/detail/dt_smooth1.tga	>>	mapsgfx/detail/dt_smooth1.tga
gfx/detail/dt_stone1.tga	>>	mapsgfx/detail/dt_stone1.tga
gfx/detail/dt_stone4.tga	>>	mapsgfx/detail/dt_stone4.tga
gfx/detail/dt_wood1.tga	>>	mapsgfx/detail/dt_wood1.tga
gfx/detail/dt_wood2.tga	>>	mapsgfx/detail/dt_wood2.tga
gfx/detail/merd_dirt.tga	>>	mapsgfx/detail/merd_dirt.tga
gfx/detail/metal.tga	>>	mapsgfx/detail/metal.tga
gfx/detail/mountain1.tga	>>	mapsgfx/detail/mountain1.tga
gfx/detail/ridge.tga	>>	mapsgfx/detail/ridge.tga
gfx/detail/ridgetop.tga	>>	mapsgfx/detail/ridgetop.tga
gfx/detail/rock.tga	>>	mapsgfx/detail/rock.tga
gfx/detail/sand.tga	>>	mapsgfx/detail/sand.tga
gfx/detail/sturm_dirt.tga	>>	mapsgfx/detail/sturm_dirt.tga
gfx/detail/sturm_rubble.tga	>>	mapsgfx/detail/sturm_rubble.tga
gfx/detail/tiles.tga	>>	mapsgfx/detail/tiles.tga
gfx/detail/tilessm.tga	>>	mapsgfx/detail/tilessm.tga
gfx/detail/wall.tga	>>	mapsgfx/detail/wall.tga
gfx/detail/wall1.tga	>>	mapsgfx/detail/wall1.tga
maps/kzblt_zigzaghop.bsp	>>	maps/kzblt_zigzaghop.bsp
maps/kzblt_zigzaghop.res	>>	maps/kzblt_zigzaghop.res
maps/kzblt_zigzaghop.txt	>>	kzblt_zigzaghop.txt
maps/kzblt_zigzaghop_detail.txt	>>	kzblt_zigzaghop_detail.txt
models/kzblt_zigzaghop/barrel.mdl	>>	models/kzblt_zigzaghop/barrel.mdl
models/kzblt_zigzaghop/heal.mdl	>>	models/kzblt_zigzaghop/heal.mdl
sound/waterrun.wav	>>	sound/waterrun.wav