Marcel Taeumel uploaded a new version of Installer-Core to project The Trunk:
http://source.squeak.org/trunk/Installer-Core-mt.439.mcz

==================== Summary ====================

Name: Installer-Core-mt.439
Author: mt
Time: 26 February 2020, 5:14:11.803527 pm
UUID: 8668f8a6-e208-054b-bafa-d397118f5ee5
Ancestors: Installer-Core-mt.438

Prepare 5.3rc2 --- Removes invalid reference to universe installer.

=============== Diff against Installer-Core-mt.438 ===============

Item was removed:
- ----- Method: Installer class>>universe (in category 'universe') -----
- universe
- 
- 	^ InstallerUniverse default!