here is an application that help you install/download/extract  maps in counter-strike 1.6

settings:

once you open the .exe file it asks you to add your game folder (cstrike) and Winrar.exe path ,

In addition to that there is a checkbox  option to check if you want to delete the map
source file after downloading & extracting the map (it delete the map.zip/.rar/.7z).

usage: 

Download a specefic map or search by 2 letters ex.(de,cs,fy,ze).

Recommended search query :
-search for full correct map name.
-search by 2 letters ex.(de,cs,fy,ze,etc..).

After download is done it asks you if want to extract the map to game folder.

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In case you have already got the map src file 
You can extract a map or multiple maps src files at once,
Just go to extract page, select the maps you want to extract in.

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NOTES:
In this version searching is limited due to api related stuff.
(in case searching by two letters output same results) while if u search for full map name it's fine.

UPCOMMING UPDATES :
-improve searching.
-try to get some server's fdl maps files pack, (so players can easly download and install server requierments)
-add an extra info about searching maps.

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Contact:
Feel free to report bugs & contact me .

source code :
github 

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you can download the map_installer1.5 exe for Windows here ⇒ Dropbox / MediaFire