Has there been any update on this? I am running into this scenario as well. ... View more

@banna_k, I also noticed .ism.779 could be restored and this worked for a product that had only been released once on InstallShield 2019 R2, but I still had to apply the hot-fix on a product that had been released multiple times on this version. After uninstalling InstallShield 2019 R2, resetting the schema version manually allowed me to reload the setup project at a specific build state and rebuild with InstallShield 2018 R2. ... View more

Orca didn't do much help for me as I'm working out of Visual Studio; I don't have access to the .msi file. I opened .ism file in Notepad and came across this setting: <row><td>SchemaVersion</td><td>779</td></row> After upgrading to InstallShield 2019 R2 this value changed to 782, I reverted back to 779 and was able to reopen my .ism file in both Visual Studio and in standalone InstallShield 2018 R2. Looks like this does what I need. Hopefully someone official from InstallShield can chime in and mention if there are any side effects to this. ... View more

What is ORCA? ... View more

I ran virustotal and malwarebytes on three installers we built with InstallShield 2019 R2. virustotal detected suspicious items. malwarebytes did not detect any suspicious items. ... View more