Comment 1 for bug 1788843

Perhaps you could leave this as a workaround as well(took me a while to figure out so maybe it will save someone else's time):

You can run the interactive window using jython standalone interpreter jar, as well as sikulixapi jar, both linked on download page: https://raiman.github.io/SikuliX1/downloads.html

Run this in command line:
java.exe -cp "C:\SikuliX\sikulixapi.jar;C:\SikuliX\jython-standalone-2.7.1.jar" org.python.util.jython

then in jython environment:
import org.sikuli.script.SikulixForJython
from sikuli.Sikuli import *