请问缺少的.sty文件如何安装？

zyzx

" S7 A2 v% A- v4 D, s( b0 g
( V0 |# i9 a) e0 a9 i: g5 S; F& o在texworks里编译一些模版，总是出现“缺少.sty”文件的报错，比如：
“
9 G- J  A4 J1 b0 V0 j9 G1 e

! 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:

”

* ?' W: q) O( N' X* r( ^+ F4 W然后我从ctan上下载了booktabs文件夹，里面有这么几个文件：
% `2 C! f0 O/ Z- ?# o$ L$ nbooktabs.dtx, booktabs.sty, booktabs.pdf, booktabs.ins, copying, readme
. G6 u" ^2 S. {: F5 o其中readme里面有文件列表和安装方法：
% p% `' X2 @5 y* S' _! ]“
) ^; t4 Y3 B& ~3 ], Y, J! ?FILES IN DISTRIBUTION
) _+ z) v2 R  M' v" E=====================
   BASE DISTRIBUTION:
      README        This file.
* f  j# h' p; u# f  k) X      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".
   DOCUMENTATION:
      booktabs.pdf  User manual for booktabs package. It was produced by executing:
, f: H! O/ s' P# h9 m) F" M                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
" Y8 B8 B" z& J. h                       makeindex -s gglo.ist -o booktabs.gls booktabs.glo
0 p% X( u, u$ h# ^                       makeindex -s gind.ist -o booktabs.ind booktabs.idx
                       pdflatex booktabs.dtx
                       pdflatex booktabs.dtx
+ c! g0 d0 G+ U) nBASIC INSTALLATION
====================
   The minimum requirement to use the package is the to have booktabs.sty in a directory where TeX can find it.
- v7 s5 {7 P# q& ^% m( M. Q) y   For a basic installation on a TDS compliant system, move the following files to the following directories:
     <texmf>/tex/latex/booktabs/
' a0 \, Q* L. N: U& _( n        booktabs.sty
     <texmf>/source/latex/booktabs/
         booktabs.ins
         booktabs.dtx
         COPY
     <texmf>/doc/latex/booktabs/
3 G' i3 ~. v5 ^5 P4 v         README
2 K4 x; D* p2 G- |         booktabs.pdf
. \8 d# F* E! j2 Q" h/ ]”

" U5 T' y( V- G, L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！