VirtualBox disable check for update

I recently installed Slackware64 15.0 on one of my boxes (yey!). Not my main system, but it is still nice to have it… I want to play Heroes III in a virtual machine, therefore I installed VirtualBox 6.1. I used the “All distributions” run file and the installation went fine. However, it would not start.

When executed from the terminal (I am using Konsole on KDE) it crashed. I searched a bit and it seems that checking for updates should be disabled. Running the following in the terminal as normal user did the trick:

VBoxManage setextradata global GUI/UpdateDate never

Now it starts and runs just fine!