Mdblaunch.bat seems to work:

C:\Program Files\MonetDB\MonetDB5>mserver5 --dbpath=dbfarm\voc\ --set mapi_port=50000

# MonetDB 5 server v11.33.3 (Apr2019)

# Serving database 'voc', using 12 threads

# Compiled for x86_64-pc-winnt/64bit

# Found 31.927 GiB available main-memory.

# Copyright (c) 1993 - July 2008 CWI.

# Copyright (c) August 2008 - 2019 MonetDB B.V., all rights reserved

# Visit https://www.monetdb.org/ for further information

# Listening for connection requests on mapi:monetdb://127.0.0.1:50000/

# MonetDB/GIS module loaded

# MonetDB/SQL module loaded

>

But neither of these batch files work.

C:\Program Files\MonetDB\MonetDB5>MSQLserver.bat

MonetDB/Python Disabled: Python 3.7 installation not found.

!FATAL: BBPinit: incompatible BBP version: expected 061041, got 061033.

This database was probably created by a too old version of MonetDB.

Press any key to continue . . .

C:\Program Files\MonetDB\MonetDB5>M5server.bat

MonetDB/Python Disabled: Python 3.7 installation not found.

!FATAL: BBPinit: incompatible BBP version: expected 061041, got 061033.

This database was probably created by a too old version of MonetDB.

Press any key to continue . . .

They complain about the server version.

I tried deleting the database folder and restarting.

The database was rebuilt.  But I still get the errors.

How do I fix this error?

I do not have real database systems.  I only have the voc sample data.