Hi @Ottmar, we found the issue and are working on releasing a new revision of Drupal. It should be versioned 8.7.2-1 in Bitnami.com. It should be out by end-of-day.
In the meantime you can fix this on your side by replacing the following file:
Replace it with a 32-bit zlib1.dll. You can find such binaries in the Internet, e.g. here.