How can I handle this error?

[admin admin]

NOTE: I have had SourceTree running in the past, and I have no idea why this error is being thrown;

Application installed (and operating previously); Atlassian Sourcetree 2.6.10.

Error being thrown when the application is launched;

{

This application requires one of the following versions of the .NET Framework:

.NETFramework,Version=4.7.1

Do you want to install this .NET Framework version now?
}

When yes is clicked to; Download the .NET Framework 4.7.2 from the provided web page,
the application ( NDP472-KB4054531-Web.exe ) returns the following;

{

Details

.NET Framework 4.7.2 or a later update is already installed on this computer.

}

[admin admin]

This issue was caused, in my case, by Windows 10 update fly-by-night installations resulting in an update to .NET;

This issue was resolved by changing the .NET Framework version explicitly identified in the C:\Users\XXXX\AppData\Local\SourceTree\app-2.6.10\SourceTree.exe.config file;

Modify Line 17: <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.1"/>

with v4.7.2 as below;

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>

Moving forward, it may be valuable to add a function, which validates the version being used, and automatically updates itself according to the installed version of .NETFramework; adding 1 to the posterior version and validating again (with a limit of some kind added so that the application doesn't spin into a perpetual loop);
https://docs.microsoft.com/en-us/dotnet/core/versions/

[admin admin]

Likewise a quick logical step could be to check what version is installed (4.7.2), and if greater than expected version (4.7.1), to modify the configuration file; SourceTree.exe.config to the installed version.

This assumes that .NET AND SourceTree are both programmed to be version agnostic internally.

[admin admin]

https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed