need help converting 2.5 plg to 1.5 - Joomla! Forum - community, help and support

many in advance.
here have joomla 17 , 25 plugin,
http://jextensions.galaa.mn/?160-login- ... -more.html
here xml anyway,

<?xml version="1.0" encoding="utf-8"?>
<extension version="2.5" type="plugin" group="content" method="upgrade">
<name>content - login read more</name>
<author>galaa</author>
<creationdate>2012-06-21</creationdate>
<copyright>copyright (c) 2011-2012 galaa (galaa.mn)</copyright>
<license>this extension in released under gnu/gpl license - http://www.gnu.org/copyleft/gpl.html</license>
<authoremail>contact@galaa.mn</authoremail>
<authorurl>http://galaa.mn/</authorurl>
<version>1.1.2</version>
<description>this plugin displays custom login read more message, when not logged in user visit article. recommended plugin order first. copyright (c) 2011-2012 galaa (http://galaa.mn/). rights reserved.</description>
<files>
<filename plugin="logintoreadmore">logintoreadmore.php</filename>
<filename>index.html</filename>
</files>
<languages folder="language">
<language tag="en-gb">en-gb/en-gb.plg_content_logintoreadmore.ini</language>
<language tag="en-gb">en-gb/en-gb.plg_content_logintoreadmore.sys.ini</language>
</languages>
<config>
<fields name="params">
<fieldset name="basic">
<field name="categories" type="text" default="" size="30" label="categories" description="categories_desc" />
<field name="categories_type" type="radio" default="exclude" label="categories_type" description="categories_type_desc" >
<option value="exclude">exclude</option>
<option value="include">include</option>
</field>
<field name="articles" type="text" default="" size="30" label="articles" description="articles_desc" />
<field name="articles_type" type="radio" default="exclude" label="articles_type" description="articles_type_desc" >
<option value="exclude">exclude</option>
<option value="include">include</option>
</field>
<field name="login_url" type="text" default="" size="30" label="login_url" description="loginurl_desc" />
<field name="login_use" type="radio" default="yes" label="login_use" description="loginuse_desc" >
<option value="yes">login_use_yes</option>
<option value="no">login_use_no</option>
</field>
<field name="login_text" type="text" default="please login or register see full article." size="30" label="login_text" description="logintext_desc" />
<field name="login_title" type="text" default="you need login or register read article!" size="30" label="login_title" description="logintitle_desc" />
<field name="search_bots" type="text" default="googlebot,yahoo,msnbot,slurp,webcrawler,zyborg,scooter,stackrambler,aport,lycos,webalta,ia_archiver,fast" size="30" label="search_bots" description="searchbots_desc" />
</fieldset>
</fields>
</config>
</extension>

any 1 changes put here make installable joomla 1.5, because jm15 tells no valid xml during installation.

help appreciated

hi
its easy (converting xml file)
but possible not work in joomla 1.5 !
because converted 1.5 plugin 2.5 plugin & not work!
because recommended edit php.file

for edit xml file & convert 1.5
look @ link :
http://www.minitek.gr/tutorials/joomla- ... la-16.html


regard