Our recommended & hosted version download:
VirtualBox-6.1.8-137981-Win
Ok, there are various versions of VirtualBox.. But this direct link off our server is the only version you should be downloading and using. We HIGHLY recommend that you DO NOT UPGRADE upon every startup or downgrade to any other version as this may or may not cause issues. This is the specific version that was used in creating DSGM in a VM environment. So we ask that you download this version and this version only and not to upgrade when it asks you to upon every start up.

but if you want to take chances then visit:
VirtualBox