The following bug has been logged on the website:
Bug reference: 14065
Logged by: Van Hertum Bert
Email address: bert.vanhertum.ext@klav.be
PostgreSQL version: 9.5.2
Operating system: Windows
Description:
When installed via the installer, the default locale and collation for the
postgres db are set to Dutch_Netherlands instead of Dutch_Belgium; this
causes lots of problems for upgrading from a Dutch_Belgium installation.