problem installing RTC Extention for Eclipse 4.x 6.0.3

I've installed:
IBM® Developer for z Systems® 14.0.0.3iFix2
Rational Team Concert - Client for Eclipse 4.2.x IDE 6.0.1
IBM® Rational® Team Concert Integration for z Systems 14.0.0.3

Tried to run this, runs perfect.

Then I want to update the RTC client to 6.0.3 but I get an installation error (sorry in Dutch):

  De installatie kan niet worden voltooid omdat een of meer vereiste items niet zijn gevonden.

    Software die wordt geïnstalleerd: IBM Software Delivery Platform 2017.5.23.092029 (IBM Software Delivery Platform com.ibm.sdp.eclipse.ide 2017.5.23.092029)

    Ontbrekende vereiste: Dependency Team Build for IBM i UI Plug-in 1.0.700.v20160930_2358 (com.ibm.team.enterprise.ibmi.build.ui 1.0.700.v20160930_2358) vereist 'bundle com.ibm.team.enterprise.ibmi.build.client 0.0.0', die niet kan worden gevonden
Kan niet voldoen aan dependency:
Van: IBM Software Delivery Platform 2017.5.23.092029 (IBM Software Delivery Platform com.ibm.sdp.eclipse.ide 2017.5.23.092029)

Naar: com.ibm.team.enterprise.ibmi.build.feature.ui.feature.group [1.0.1200.v20161027_2010]

    Kan niet voldoen aan dependency:
Van: Enterprise Extensions IBM i Build UI Feature 1.0.1200.v20161027_2010 (com.ibm.team.enterprise.ibmi.build.feature.ui.feature.group 1.0.1200.v20161027_2010)

 Naar: com.ibm.team.enterprise.ibmi.build.ui [1.0.700.v20160930_2358]

Seems to be a dependency problem.

What am I doing wrong?