El archivo lbr es en realidad un archivo XML. Los paquetes están en elementos (ver ejemplo a continuación).
Abra el archivo en un editor de texto (por ejemplo, Notepad ++), haga un duplicado del elemento del paquete (por ejemplo, justo debajo del original), cambie el nombre y guarde.
<package name="RFM69HCW">
<wire x1="-8.09" y1="-7.95" x2="7.91" y2="-7.95" width="0.127" layer="21"/>
<wire x1="7.91" y1="-7.95" x2="7.91" y2="8.05" width="0.127" layer="21"/>
<wire x1="7.91" y1="8.05" x2="-8.09" y2="8.05" width="0.127" layer="21"/>
<wire x1="-8.09" y1="8.05" x2="-8.09" y2="-7.95" width="0.127" layer="21"/>
<wire x1="-4.99" y1="5.95" x2="-0.09" y2="5.95" width="0.127" layer="21"/>
<wire x1="-0.09" y1="5.95" x2="-0.09" y2="2.05" width="0.127" layer="21"/>
<wire x1="-0.09" y1="2.05" x2="-5.09" y2="2.05" width="0.127" layer="21"/>
<wire x1="-5.09" y1="2.05" x2="-5.09" y2="5.95" width="0.127" layer="21"/>
<smd name="DIO2" x="6.91" y="7.05" dx="3" dy="1.2" layer="1"/>
<smd name="DIO1" x="6.91" y="5.05" dx="3" dy="1.2" layer="1"/>
<smd name="DIO0" x="6.91" y="3.05" dx="3" dy="1.2" layer="1"/>
<smd name="3.3V" x="6.91" y="1.05" dx="3" dy="1.2" layer="1"/>
<smd name="DIO4" x="6.91" y="-0.95" dx="3" dy="1.2" layer="1"/>
<smd name="DIO3" x="6.91" y="-2.95" dx="3" dy="1.2" layer="1"/>
<smd name="GND_3" x="6.91" y="-4.95" dx="3" dy="1.2" layer="1"/>
<smd name="ANT" x="6.91" y="-6.95" dx="3" dy="1.2" layer="1"/>
<smd name="GND_1" x="-7.09" y="7.05" dx="3" dy="1.2" layer="1"/>
<smd name="MISO" x="-7.09" y="5.05" dx="3" dy="1.2" layer="1"/>
<smd name="MOSI" x="-7.09" y="3.05" dx="3" dy="1.2" layer="1"/>
<smd name="SCK" x="-7.09" y="1.05" dx="3" dy="1.2" layer="1"/>
<smd name="NSS" x="-7.09" y="-0.95" dx="3" dy="1.2" layer="1"/>
<smd name="RESET" x="-7.09" y="-2.95" dx="3" dy="1.2" layer="1"/>
<smd name="DIO5" x="-7.09" y="-4.95" dx="3" dy="1.2" layer="1"/>
<smd name="GND_2" x="-7.09" y="-6.95" dx="3" dy="1.2" layer="1"/>
<text x="-0.09" y="0.05" size="1.27" layer="25" align="center">>NAME</text>
<text x="-0.09" y="-1.95" size="1.27" layer="27" align="center">>VALUE</text>
</package>