A thread on betaarchive claims Microsoft only ever provided OEM and upgrade versions of DOS - no stand alone "for PCs without DOS" release. Not sure what you'd do back then to get your hands on a copy of MS-DOS - perhaps buy an OEM copy at the same time as a sufficient quantity of parts? Or just buy DR-DOS which was available in a non-upgrade version?

Tnks for the reply, in fact i only find something like this:

Imho, English language users don't really need MS-DOS 6 anymore.

MS-DOS 6.2x was often bundled with the "supplemental" diskettes, which contained all the 6.0 programs removed in 6.2x.

Rather, it were the users in other countries who had a need for old MS-DOS 6.0.

Because, these "supplemental" disks available in their countries contained English language versions of the DOS 6.0 programs merely, not the localized versions.

I can only guess, but maybe the supplemental disks were simply included in some self-extracting package from the Microsoft Knowledge Base.
So companies/OEMs had to make them themselves and bundle them with the real MS-DOS 6.2x disk set.