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:

”

& d7 u) e- @2 l- Q1 Z. Q6 g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
8 Z9 T0 m; N. D. e4 M. }- H其中readme里面有文件列表和安装方法：
“
" z3 `4 X+ V- F% F3 K5 ^, WFILES IN DISTRIBUTION
=====================
3 j/ K$ u9 ]0 u3 @: H& i9 B   BASE DISTRIBUTION:
, h5 L% w* W8 g4 q4 u3 C      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".
9 A" N; {: ^& l! ^: E6 d6 O0 C( J   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
2 w. i9 v  z2 ~4 @                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
( z, B/ P: ^* N' {9 W5 b                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
/ N& {/ f/ C* Y. C! N( D. TBASIC INSTALLATION
, s* ~: x1 C+ F; m( x' c# q====================
1 `; ]1 z, M9 q+ i) ~. l& B% k" [   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
" W" t9 s/ z5 |7 V3 T   For a basic installation on a TDS compliant system, move the following files to the following directories:
     <texmf>/tex/latex/booktabs/
        booktabs.sty
     <texmf>/source/latex/booktabs/
         booktabs.ins
: c% T' d5 u: G( z         booktabs.dtx
         COPY
- G# ^  |3 i4 |5 O     <texmf>/doc/latex/booktabs/
* |6 R: E& j4 \/ H. b5 ~; T# m         README
         booktabs.pdf
”

( C# _; a2 P4 Y6 ?* ]. A. B% e! W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！