请问缺少的.sty文件如何安装？

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在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
“
# J  R( {) e. Z4 |

! LaTeX Error: File `booktabs.sty' not found.

Type X to quit or <RETURN> to proceed,

or enter new name. (Default extension: sty)

Enter file name:

”
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然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
) {. \( B* R- l7 |* ~" mbooktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
0 f- H) a2 U  _! t其中readme里面有文件列表和安装方法：
) T% F5 Q' r8 l  _, G“
FILES IN DISTRIBUTION
+ M: S# F+ m+ H) X. b5 _+ i. v=====================
   BASE DISTRIBUTION:
  C& K* X& y- }$ O; V* r      README        This file.
      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
      COPYING       GPL license file.
      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
' Y6 m  h$ q4 j9 h# _8 Z8 o   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
# {8 d0 _* [' ?6 @- W, s. }                       pdflatex booktabs.dtx
' w$ U* S' r! K) c( l                       pdflatex booktabs.dtx
- E7 v. M5 t7 ]                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
* }) t# e: w4 |                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
; }3 i- o. o- FBASIC INSTALLATION
8 z1 P6 z* v( X0 O5 h) K7 Y====================
   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
) ]7 e1 j2 Y, n9 z   For a basic installation on a TDS compliant system, move the following files to the following directories:
+ A# R0 B5 H! e& i, B6 e8 f9 \9 E' K     <texmf>/tex/latex/booktabs/
( Z6 @$ ^! v+ x6 e! [        booktabs.sty
     <texmf>/source/latex/booktabs/
         booktabs.ins
         booktabs.dtx
* C1 s/ v' ~" Y# z7 D" b6 S0 z) L         COPY
     <texmf>/doc/latex/booktabs/
         README
$ q% O# k- g, E         booktabs.pdf
”

7 X# p, g! L3 y( I0 R1 y我按上面的要求把各个文件放在了相应的位置（红字部分没有操作，因为不知道怎么操作），但是运行模版后仍然报错说找不到，怎么办呢？请大家帮忙！