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Any idea on how to install it on 86box?
There was no proper installer for DOS before version 3.30 or so, when a very rudimentary version of SELECT was introduced. Some OEMs like Compaq had their own proprietary installers. DOS 4.0 later expanded SELECT functionality but it was a very clunky and downright stupid design, so no wonder it was replaced by the much better SETUP in 5.0.
For earlier versions, you just format the hard disk with FORMAT C: /S, which writes the DOS bootsector to the volume and copies over system files (IO.SYS, MSDOS.SYS and COMMAND.COM). You then have a bootable hard disk with DOS on it and you can copy the other programs over manually.