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