I have the same problem in IS 2009 in a basic msi project. I have configured my major upgrade as per the IS documentation, but when i install i am left with 2 ARP entries. Having looked through the msi log i cant seem to determine if my existing installation was found... perhaps my major upgrade configuration is incorrect? if so this could be a dfferent problem. If anyone could shed any light on configuring a major upgrade that would be great (i have searched the forum for a while now which has got me to this point, so thank for all the help so far).
... View more