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：
1 K$ M" l  u5 u- X“
1 W/ }+ c  c$ X/ R8 [' O

! 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：
booktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
$ s' c, M: k1 ^6 Q0 p其中readme里面有文件列表和安装方法：
“
* d" E3 ^) R6 f5 |3 D: t, ?7 vFILES IN DISTRIBUTION
=====================
   BASE DISTRIBUTION:
" |, `# x$ `# V7 n. h# z5 F; W# ^      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".
1 G" U0 m' L, V& Y& k6 v; U   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
7 e  i; E; J2 a3 D                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
) m' f0 a# g: Y% ~( |. E5 a                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
4 K  W6 z- _7 T' f4 }                       pdflatex booktabs.dtx
BASIC INSTALLATION
4 P. Z' C  x6 x, D====================
/ U+ H8 n" }# ]* L1 ]( H1 p   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
* D. i2 K" S" L! b5 l4 [   For a basic installation on a TDS compliant system, move the following files to the following directories:
; y- O: F  I% k6 e     <texmf>/tex/latex/booktabs/
$ X* ]( D) w0 E: j4 X0 N        booktabs.sty
- o) v, e9 \( P1 r0 \. D     <texmf>/source/latex/booktabs/
& }3 M8 Z0 s5 {         booktabs.ins
5 n6 ^# h/ N! W% r% M, {) @         booktabs.dtx
         COPY
     <texmf>/doc/latex/booktabs/
         README
         booktabs.pdf
' V! Y. f2 U( H% N9 }9 w# r”

  e6 z. h# S7 r$ t8 Q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！