Build 58s is the Chicago Preliminary Development Kit build and part of Milestone 4 stage. It is currently the earliest leaked build of Chicago. It is most known for it's early shell, which had 3 start buttons and menus instead of one.
Installation Guide
Installing from Windows 95 Boot Floppy
1. Prepare Disk with fdisk.exe, reboot, then format. format.com C:
2. Change to the CD-ROM and enter the RETAIL directory.
3. Run dossetup
4. Accept the default settings then continue to the file copying process.
5. When complete, reboot with the floppy still connected.
6. Run edit.com and press ALT+F+O. Browse to C:\config.sys
7. Change Files=30 and Buffers=30 to Files=90 and Buffers=90
8. Save changes (ALT+F+S) then exit (ALT+F+X)
9. Remove floppy and then boot to Windows.
