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：
3 T/ c( S! X$ h/ p7 ~4 l* W9 d& U+ u“

! 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:

”

$ s8 \9 U, C4 j7 `7 y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：
“
FILES IN DISTRIBUTION
=====================
7 |2 @) W8 q, X   BASE DISTRIBUTION:
8 K$ J3 M5 P1 C( u7 a; ~2 k      README        This file.
      booktabs.ins  Package installation file.
; W3 }/ ]1 n* z9 B5 B+ e& r      booktabs.dtx  Package source file.
      COPYING       GPL license file.
  T5 N$ Z. L: i      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
   DOCUMENTATION:
, x- n# i( s6 [      booktabs.pdf  User manual for booktabs package. It was produced by executing:
                       pdflatex booktabs.dtx
3 o( w2 o# i5 }! D2 g7 {; e( i                       pdflatex booktabs.dtx
0 u0 g3 D; W9 G: L2 {                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
9 F- S& b( ]/ ~: r# x                       pdflatex booktabs.dtx
. y' L! H( N, X4 e: T0 O% \                       pdflatex booktabs.dtx
. n2 R) [8 w% d" N% |! ABASIC INSTALLATION
" b1 _0 O0 }0 s) p  ^====================
   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
; U6 {" E& n" g% y5 W   For a basic installation on a TDS compliant system, move the following files to the following directories:
& n4 p/ Q0 `9 x/ i8 r2 _     <texmf>/tex/latex/booktabs/
        booktabs.sty
     <texmf>/source/latex/booktabs/
5 o7 f# y4 h- [+ n( `! n) @+ u5 @         booktabs.ins
         booktabs.dtx
         COPY
     <texmf>/doc/latex/booktabs/
3 R9 k; Q: g) c3 A3 L         README
# x" G/ e( }  `, G: ~         booktabs.pdf
% `6 z5 R8 V1 H% s" L7 H1 x”
" V! C; Y# \, n! ^. D4 ^% V
* l& s- Q: B9 L5 `5 ?* W* M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！