请问一个rails的问题，关于插件的

我需要安装will_paginate插件，但是svn在公司局域网连接不上，于是我需要把will_paginate下载到本地安装，但是不知道怎么按照。
新手，对rails的插件机理不是很懂。

尝试中，把will_paginate解压放到vendor/plugins/will_paginate下面
启动server的时候，报错。

=> Booting WEBrick...
./script/../config/../vendor/plugins/will_paginate/lib/will_paginate/finder.rb:1
1:in `included': undefined method `alias_method_chain' for #<Class:ActiveRecord:
:Base> (NoMethodError)
from ./script/../config/../vendor/plugins/will_paginate/init.rb:7:in `in
clude'
from ./script/../config/../vendor/plugins/will_paginate/init.rb:7:in `se
nd'
from ./script/../config/../vendor/plugins/will_paginate/init.rb:7:in `lo
ad_plugin'
from d:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/initializer.rb:348:i
n `load_plugin'
from d:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_suppo
rt/core_ext/kernel/reporting.rb:11:in `silence_warnings'
from d:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/initializer.rb:348:i
n `load_plugin'
from d:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/initializer.rb:158:i
n `load_plugins'
from d:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/initializer.rb:158:i
n `each'
... 12 levels...
from d:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:3
0
from d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `ge
m_original_require'
from d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `re
quire'
from script/server:3


似乎是版本有问题，我的
rails 1.2.4
ruby 1.8.6
貌似都是最新的。

问题：
1.插件安装，如果不用svn，是不是可以把文件解压直接放在plugins中。
2.上面的启动错误是不是版本问题呢。。

谢谢拉
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