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：
“

! 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:

”

+ {  o% d9 M! F6 E然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
2 G3 f+ p0 p( p& m6 \booktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
其中readme里面有文件列表和安装方法：
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FILES IN DISTRIBUTION
=====================
* w3 L+ e+ `8 I8 r2 i. |1 T   BASE DISTRIBUTION:
      README        This file.
      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
      COPYING       GPL license file.
6 z1 \' o: h( q! k1 L/ I      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
   DOCUMENTATION:
+ t: N2 M! V! M  [/ ?. U8 ]- m      booktabs.pdf  User manual for booktabs package. It was produced by executing:
                       pdflatex booktabs.dtx
0 ?, M/ t4 n. r. |% F                       pdflatex booktabs.dtx
                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
$ j$ o2 Q7 L# K5 E! ^% J                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
1 F- D" l3 i+ }/ y. r. w  xBASIC INSTALLATION
4 D* l' K0 L7 x! h# h2 T" W====================
8 X2 P9 s5 h6 K- B% z   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
   For a basic installation on a TDS compliant system, move the following files to the following directories:
     <texmf>/tex/latex/booktabs/
8 w6 c8 y! \/ G        booktabs.sty
+ e( p+ l: L7 D0 R$ Z     <texmf>/source/latex/booktabs/
. o/ w1 O3 F; s0 E! f  ~# Z         booktabs.ins
         booktabs.dtx
8 K& ]0 Y2 h1 r3 N' E; J- j; i         COPY
     <texmf>/doc/latex/booktabs/
         README
         booktabs.pdf
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; p$ \( q, i  s, `+ f; V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！