Hi Carlos,
The jar file now goes in C:\awareim\CustomJars. You may need to create the CustomJars folder the first time, but it does not get deleted on an AwareIM upgrade, so it and it's contents should remain between upgrades.
The setenv.bat and setenvClient.bat files now automatically access everything in the CustomJars file, so you no longer have to add the path to your jar files to those.
for custom functions, you still need to add
FunctionLibraryTranslator=javaapplication5.Translator
to the BASServer.props file.
Hope that helps.