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:

”
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3 ~- X6 |7 y7 ~) Q1 {1 D/ Z然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
  E; M% k- F9 _8 Q4 hbooktabs.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 ~4 }# Z  z4 G2 t, \! o$ B( X. jFILES IN DISTRIBUTION
/ n) U, _" t" c8 g) s9 A2 u; w5 S" M=====================
2 C' F; b* ~' |0 K& l" ?/ h   BASE DISTRIBUTION:
4 ]$ i/ r+ j9 ]2 |! A      README        This file.
      booktabs.ins  Package installation file.
      booktabs.dtx  Package source file.
      COPYING       GPL license file.
      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
: Z; L& i3 ~+ Y" u4 j) e   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
2 O, _. v8 a1 ~                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
2 F! N4 Y8 M+ x2 I5 w                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
  f8 F( i9 [  I  k- r! O                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
5 B4 H! g2 Z2 Z                       pdflatex booktabs.dtx
BASIC INSTALLATION
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   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
, }# n  r+ R7 T+ x. X% Q' ~   For a basic installation on a TDS compliant system, move the following files to the following directories:
* o1 s: B+ T5 Z- f8 r, W8 S     <texmf>/tex/latex/booktabs/
+ S2 x: n; ?8 V. g  c        booktabs.sty
     <texmf>/source/latex/booktabs/
( o" Y, U7 F4 t% U* u/ O         booktabs.ins
0 K0 J* g4 ?& F         booktabs.dtx
, ?9 T, x9 s# j9 e" ~) g" l# O8 j2 h         COPY
     <texmf>/doc/latex/booktabs/
         README
; r  w+ z! G+ m         booktabs.pdf
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1 r! `* Z' Z' V) X( ]+ g. f4 c2 D8 o2 h; 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！