Installer installs .NET 6 even when a higher .NET version (e.g., .NET 9) is already installed

[san616mofo]

Description:
This is not a bug, but rather a suggestion for improvement.
During the installation of Bulk Crap Uninstaller, the installer automatically installs .NET Desktop Runtime 6.0.36 (x64) without explicit user consent - it is only listed in the "Ready to Install" step under "Additional tasks".

The issue is that the installer does not check whether a newer version of .NET is already present on the system. For example, if the user already has .NET 9 installed (the latest version at the time of writing), the installer still proceeds to install .NET 6, which seems unnecessary and may clutter the system with redundant runtimes.

Expected Behavior:

• The installer (and ideally the application executable BCUninstaller.exe itself) should detect existing .NET versions.
• If a higher or compatible version is already installed, the setup should skip the installation of older runtimes.

Reasoning / Benefits:

• Keeps the system clean by avoiding redundant .NET installations.
• Saves installation time and disk space.
• Improves user control and transparency during installation.

Suggestion:
Add a runtime version check in the installer logic (and possibly in the launcher binary) to ensure that only missing or required .NET versions are installed.