Here's my steps to getting a Tekkit Lite server with plugins.
Download a fresh copy of the server from the modpack page: http://www.technicpack.net/modpack/tekkitlite
Download mcpc-plus-1.4.7-R1.1-SNAPSHOT-f534-authfix1.jar from tcpr.ca: https://tcpr.ca/downloads/mcpc
Put the file in the same folder as the server download, edit the launch.bat file to use the mcpc-plus jar.
Should it say you need to run it with Java 7 you can get that from here assuming you have 64-bit windows: http://cdn.lemonmc.com/jre-7u80-windows-x64.exe
If you get an error similar to
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.fusesource.jansi.internal.Kernel32
edit the launch.bat file again and add --nojline after the mcpc-plus jar filename.
This is a simple fix, Oracle rolled out Java 8u25 to all users 1 to 2 days ago at 12:01 AM EST. Install Java 7u67 to be able to launch modpacks from technic again. This has been discussed already here: http://www.technicpack.net/article/view/concurrentmodificationexception-in-java-18020.89
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