请问缺少的.sty文件如何安装？

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" U. p. v, I; I( S& [在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
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! 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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+ w4 x2 m/ t* n4 }, ~然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
: @3 w- ]% L1 d  y6 @. hbooktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
# Y& m" o( \. H2 K其中readme里面有文件列表和安装方法：
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FILES IN DISTRIBUTION
=====================
   BASE DISTRIBUTION:
      README        This file.
      booktabs.ins  Package installation file.
" [) {. \0 k4 }      booktabs.dtx  Package source file.
      COPYING       GPL license file.
      booktabs.sty  Package style file. It was produced by executing "latex booktabs.ins".
* o/ g3 g4 f/ b4 |/ k   DOCUMENTATION:
0 ^: k, {( K$ ], ~- D      booktabs.pdf  User manual for booktabs package. It was produced by executing:
! C0 m) l$ K: u; U8 m2 {                       pdflatex booktabs.dtx
/ [2 w( O  M& A* z                       pdflatex booktabs.dtx
                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
. B4 a0 f- |6 @( P0 P# `                       pdflatex booktabs.dtx
BASIC INSTALLATION
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' ]5 B9 Z! B' w8 S8 W2 C- b   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/
: `5 J# \* J2 R4 G8 j- ?/ Z        booktabs.sty
  k: n4 Q  s7 g  y8 }     <texmf>/source/latex/booktabs/
" f8 H1 G& ]6 I( C0 H         booktabs.ins
6 c' o% V. @% k' ~, s) o         booktabs.dtx
4 O# T; z0 \" w) R/ l; Z         COPY
; Z2 D, k7 d1 n- Z. Q/ R4 {6 {- T     <texmf>/doc/latex/booktabs/
         README
         booktabs.pdf
”

* a2 e: w& g- N# @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！