Major upagrade:
delete old version firstly, then install new version.
need to change [product code] and [package code], donnot change [Upgrade code].
1. config marjor upgrade
media->Upgrde windows install setup
2. add major upgrade
3. set properties
share upgrade code, donnot change it.
product version from 1.0.0.0.
i donnot know can change it or not.
Please makre sure [upgrade code] is same as above, donnot change it.
[detect property] should be right.
4. change product code and package code
Donnot change upgrade code.
Reference:
http://www.sliqtools.co.uk/blog/technical/installshield-major-upgrade/
when you install, old version is not delete , display 2 entries in Programs and Features, please check [upgrade code] it not “000000….”
InstallShield, Product Codes, Package Codes, and Upgrade Codes, Oh my god!
installshield forum :http://www.appinstall.cn/forumdisplay.php?fid=9&page=1
basic knowladge: http://www.cnblogs.com/jamesmile/archive/2012/10/04/2711440.html