Error installing bundle listed in startup.properties with url: mvn:org.apache.karaf.features/org.apache.karaf.features.extension/4.2.7 and startlevel: 1

I am having trouble running a fresh openhab3 installation on Win7, x64.
Does anyone know how to fix this:

openjdk version "11.0.8" 2020-07-14 LTS
OpenJDK Runtime Environment Zulu11.41+23-CA (build 11.0.8+10-LTS)
OpenJDK 64-Bit Server VM Zulu11.41+23-CA (build 11.0.8+10-LTS, mixed mode)

Launching the openHAB runtime...
Error installing bundle listed in startup.properties with url: mvn:org.apache.karaf.features/org.apache.karaf.features.extension/4.2.7 and startlevel: 1
2020-10-04 07:08:53.139 [SCHWERWIEGEND] [org.apache.karaf.main.Main] - Could not launch framework
java.lang.RuntimeException: Error installing bundle listed in startup.properties with url: mvn:org.apache.karaf.features/org.apache.karaf.features.extension/4.2.7 and startlevel: 1
	at org.apache.karaf.main.Main.installAndStartBundles(Main.java:570)
	at org.apache.karaf.main.Main.launch(Main.java:273)
	at org.apache.karaf.main.Main.main(Main.java:178)
Caused by: java.lang.RuntimeException: Could not resolve mvn:org.apache.karaf.features/org.apache.karaf.features.extension/4.2.7
	at org.apache.karaf.main.util.SimpleMavenResolver.resolve(SimpleMavenResolver.java:59)
	at org.apache.karaf.main.Main.installAndStartBundles(Main.java:562)
	... 2 more

Was a faulty build of OH3