请问缺少的.sty文件如何安装？

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8 C- M+ `! H4 A4 w9 {3 |& ]在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
“

! 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：
& x! e1 a) ~+ s. Z: h6 ]& M& xbooktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
其中readme里面有文件列表和安装方法：
“
4 l7 A! j; ~! ^FILES IN DISTRIBUTION
0 }& N4 \5 e  N. R4 n. \=====================
   BASE DISTRIBUTION:
      README        This file.
      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
' n, k% V9 |7 F- C      COPYING       GPL license file.
      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
( m  S& H: @8 }/ ~7 }# c. f                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
4 g* @6 k" _5 ?( k7 l: [                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
* `5 r7 `8 C2 b" |* A/ [: }  t                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
BASIC INSTALLATION
3 X! }8 r2 _( I====================
   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
" u" h' v: R, v( \   For a basic installation on a TDS compliant system, move the following files to the following directories:
     <texmf>/tex/latex/booktabs/
( ]# x' _! {% j" t. v+ U$ P4 o        booktabs.sty
- c1 a; l" s- l( y( {, \     <texmf>/source/latex/booktabs/
6 T2 N9 ~! @' W" ^/ Y, U1 Q         booktabs.ins
! K; K2 a- `2 U4 b0 L3 X& E) z         booktabs.dtx
4 Q$ b, G* L% ]! }& h2 Z% D         COPY
, A0 o4 ?( i! ?8 p1 A* `     <texmf>/doc/latex/booktabs/
8 k7 t6 w- L9 o# d         README
         booktabs.pdf
”

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！