请问缺少的.sty文件如何安装？

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' \/ p$ u3 Y. h3 {* Q在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
2 d$ N" m. U6 v“

! 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：
% ]/ a  H/ y7 j  tbooktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
. v) ~) ^5 _: d% S6 |其中readme里面有文件列表和安装方法：
3 Y# B, ?6 x- o) c& K“
$ C5 P- T5 v" Q% s) h, S$ dFILES IN DISTRIBUTION
1 j& S# I4 X/ W" T=====================
' p3 p+ X8 ~# V  g$ `; r8 O! }   BASE DISTRIBUTION:
      README        This file.
& I' Z# ~. E- `- y      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
5 T8 W& w/ `% \; q- |6 p% O      COPYING       GPL license file.
5 b2 G) t4 h! _' c3 t+ M5 n' z; o      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
* ^7 x( q* q9 o: }7 o   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
                       pdflatex booktabs.dtx
+ f3 @, Y+ a( O! I# k! J0 v                       pdflatex booktabs.dtx
BASIC INSTALLATION
====================
2 v" y' t, V/ t   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
0 R& t. M- o* `  a: X$ X* n   For a basic installation on a TDS compliant system, move the following files to the following directories:
$ \  [  Y. N% _3 A3 X& _  @     <texmf>/tex/latex/booktabs/
; N$ m7 V; C4 F  [# Y8 c+ o. L        booktabs.sty
     <texmf>/source/latex/booktabs/
1 f0 g* B8 L+ a; I5 R1 B0 `         booktabs.ins
- {! f  G) F& I9 o, J1 A2 z) o: \$ `         booktabs.dtx
         COPY
- I& O& s5 e% a, g     <texmf>/doc/latex/booktabs/
0 ^% J$ J/ c3 }( K         README
/ m$ E% v, h8 H) Y9 a2 Z$ P         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！