[Windows] [Installer] Confusion when attempting to install an older version of BOINC

[Vulpine05]

Describe the bug

I attempted to install an earlier version of BOINC - going from the latest development version 8.2.6 back to 8.2.4. I used the installer and I got a few messages, see the steps to reproduce below for that information.

To me this seems confusing. If the installer says that there was a problem and it needs to be repaired, then the installer shouldn't say that it installed BOINC successfully. Additionally, I would expect that running a repair would fix the problem as intended.

Steps to reproduce

1. Install BOINC 8.2.6.
2. After successful installation of 8.2.6, install 8.2.4.
3. 8.2.4 will state it has successfully installed, but with the message: "A BOINC component didn't get updated properly. Please run the repair tool from the "Control Panel - Add/Remove Programs" tool ("Control Panel - Program Features" tool on newer version of Windows).
4. Open BOINC, and it appears 8.2.4 is the version that is running. I didn't test to see what functionality could be broken.
5. Make sure BOINC client and Manager are closed.
6. Under Control Panel -> Apps & Features, click on "Modify" under the BOINC application, go through the menus to click on repair.
7. After it runs the repair, the following message is shown: "The wizard was interrupted before BOINC could be completely installed. Your system has not been modified. To complete installation at another time, please run setup again."

Expected behavior

Clearer messages if BOINC is in a functional state or not.

Screenshots

System information

• OS: Windows 10
• BOINC Versions: 8.2.4 and 8.2.6.

Additional context

No response