The following bug has been logged online:
Bug reference: 3953
Logged by: Rob von Nesselrode
Email address: robvon(at)austarnet(dot)com(dot)au
PostgreSQL version: 8.3
Operating system: WIndows XP
Description: No PostGIS option in installer
Details:
That it! No PostGIS option in installer....
Doco for install is still 8.1