请问缺少的.sty文件如何安装？

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$ N" E: N! E& l: A1 ~8 V/ D* v在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
“
* n+ ?2 P4 x  y5 `6 I0 o  W

! 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:

”
* w9 I) Z  L! i% X
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
其中readme里面有文件列表和安装方法：
“
( z7 x2 s' @* a. d3 F4 k, HFILES IN DISTRIBUTION
=====================
   BASE DISTRIBUTION:
* F. r. @+ w. }: T      README        This file.
5 `) ?' \, I- e5 N( c- ^* d: r      booktabs.ins  Package installation file.
9 R' n. c0 ~, y8 t: `7 ]' ^      booktabs.dtx  Package source file.
% w6 I9 N1 {7 G      COPYING       GPL license file.
      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
   DOCUMENTATION:
% d* A0 t, b* x7 O$ a" a      booktabs.pdf  User manual for booktabs package. It was produced by executing:
                       pdflatex booktabs.dtx
; s+ V3 W# ~/ p4 K. j, y                       pdflatex booktabs.dtx
2 Z. Z3 r) z% Y- X2 b5 b                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
7 q. ?/ L7 K* h, \6 y: [/ i                       pdflatex booktabs.dtx
BASIC INSTALLATION
====================
   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/
        booktabs.sty
. w% m( r% K4 e* b9 I     <texmf>/source/latex/booktabs/
         booktabs.ins
9 u9 H9 b, K2 h         booktabs.dtx
         COPY
     <texmf>/doc/latex/booktabs/
         README
' S' x2 Z+ ?. z0 u) o         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！