This will not work as it is today.

Reason :

• The uninstall is called at the end of the installation of DistroAV. The uninstall is targeting the AppID, BUT 6.0.0 and 6.1.0 share the same ID.
  That means : The installer will install 6.1.0, then delete 6.1.0. leaving 6.0.0 intact & removing 6.1.0.

We should uninstall 6.0.0 as a "pre-install" step (via uninstaller).
However, it is fine to keep the "files clean-up" (removing the files directly) as a "post-install" step.

While digging into this I found out that DistroAV 6.1.0 doe snot set the proper registry key (which is why this might have worked for you without issue).

We now have 2 issues to fix :

• 6.0.0 is not uninstalled
• 6.1.0 is not installed properly on Windows Registry (Key is {}_is1)

Tested as follow:

• DistroAV 6.0.0 installed
• DistroAV 6.1.0 installed

Run This PR Installer with /LOG flag.

Detection of 6.0.0 & 6.1.0 works, Uninstall return code 0 (success)

2025-06-11 18:08:36.565   DistroAV plugin version already installed detected : 6.0.0...
2025-06-11 18:08:36.565   Uninstalling previous DistroAV plugin version...
2025-06-11 18:08:36.767   Uninstall previous DistroAV return code: 0
2025-06-11 18:08:36.767   Uninstalling previous DistroAV plugin version 6.1.0...
2025-06-11 18:08:36.947   Uninstall previous DistroAV return code: 0
2025-06-11 18:08:36.947   Starting the installation process.

Confirmed that

• 6.1.0 - Registry entry is gone
• 6.1.0 files are removed as well

Issue :

• 6.0.0 - Registry entry is gone (not supposed to)

• A new entry in registry is "FF773A8D-7648-4630-8155-3D5190CDF785" - Expected to be "{FF773A8D-7648-4630-8155-3D5190CDF785}".

Good outcome, it now look cleaner in the Uninstall list :

The latest commit before this message fix the {{APPID}} issue.

But brings to light that the Setup WILL use the previous Directory.

This can be fixed with : UsePreviousAppDir=no (default is yes) and this will not try to use the previous install location.