The configuration of "sbt launcher jars" paths in the general jenkins configuration page (i.e. globally) should be overridable in "Tool location" for each node (like JDK, Git & Hg paths).

If running in a mixed environment with both linux and windows slaves, the path to sbt (like the other tools) will typically be very different on the two platforms (e.g. c:\sbt\sbt-launcher.jar vs. /usr/local/bin/sbt)