[NEED HELP] how to i redownload maps

[Byte]

Surf maps: http://fastdl.invexgaming.com.au/fastdl/...1171/maps/
1v1 maps: http://fastdl.invexgaming.com.au/fastdl/...1176/maps/
JB maps: http://fastdl.invexgaming.com.au/fastdl/...1201/maps/

Simply go to your local CSGO directory, delete the particular map that is there.
Then download the compressed map from the links above, extract it using a tool like 7-Zip.
Then put it into your csgo/maps directory.