ESRI's PC ARC/INFO Webpage (Literature, upgrades, utilities, system requirements)
What's new with Version 4.0 (PDF)
PC ARC/INFO ARCPLOT User's Guide (PDF)
PC ARC/INFO ARCEDIT User's Guide (PDF)
Documentation available directly from ESRI at reduced prices.

Pre Install Tips

Before you install your upgrade, save your current PC ARC/INFO installation environment. Version 4 should be installed into a separate installlation directory from previous versions. Note that PC ARC/INFO 4 no longer requires environment variables to run, so you may want to delete these references once you have successfully installed your upgrade.
Full install requires ??? Megabytes disk space

Download CD-ROM Image	Ver.	Available here	Size	Registration Number	Source CD-ROM	ESRI Ship No.
arcinfo-40win.exe	4.0	02/01/01	30.4 Mb	regno	PC ARC/INFO CD-ROM (85584)	84937

OhioLink-OEH/ESRI P1.5.1 7/30/99