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：
8 a( _5 `& [) _! u, L* ]“

! 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:

”

然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
booktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
. B, t0 @4 T+ i6 `3 D其中readme里面有文件列表和安装方法：
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6 ^+ s! {* M6 j) w9 O8 z9 kFILES IN DISTRIBUTION
=====================
; _- [7 ~  B# {! c0 E   BASE DISTRIBUTION:
      README        This file.
" u: T3 G& Q0 [1 V      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
      COPYING       GPL license file.
9 w- K, M  ^8 e; W# ~3 e      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
. I2 ]& S- p' |3 P( [4 H   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
7 F3 w1 Y; g! z' b2 a4 Y                       pdflatex booktabs.dtx
% \/ s' l/ b5 x4 ]3 ]) g: a                       pdflatex booktabs.dtx
6 j# ?5 V2 _( M% HBASIC INSTALLATION
====================
5 S+ _; ?* Z% V8 o3 ~* ~0 A   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
$ C# O* k* Z7 `8 h+ d5 W% k# _   For a basic installation on a TDS compliant system, move the following files to the following directories:
  }  Z$ \( K* |7 i     <texmf>/tex/latex/booktabs/
        booktabs.sty
     <texmf>/source/latex/booktabs/
         booktabs.ins
         booktabs.dtx
         COPY
     <texmf>/doc/latex/booktabs/
% [2 j  @# w( n- F6 N         README
0 [# {$ c$ v: {0 ^5 g         booktabs.pdf
2 g# [# e2 P& n6 V3 ?, p”

3 U9 \; t( r8 j! F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！