Is your user an admin? Would you try right clicking the installer and "running as Admin"?
I made WDC-1.19.414.exe available again. Would you try it, too?
I don't have Windows 11 for testing.
I've tried running as admin on both versions and it doesn't help, unfortunately. I can confirm the installers work, as I tried them in a Win7 virtual machine, but the installer seems to be picky about something when it comes to Win11. I don't think it's your fault, I feel rather confident it's Microsoft's fault for breaking compatibility somewhere (along with making it harder to engage with compatibility in the newest versions of Win11, which they force users to update to). Regardless, I can definitely use the software in the virtual machine I have set up or otherwise try moving them outside of the virtual machine to test.
Btw, I don't blame you for not having Win11 to test, if it wasn't pre-installed on my current machine I wouldn't be using it.
Since 1.19.414 also has this issue, that means the minor change I made in the installer didn't break Windows 11 support. It just didn't work to begin with... I will try digging around to see whether I can find something about NSIS installers that Windows 11 doesn't like.
Are you able to try running the installer from an elevated command prompt and tell me whether it outputs an error message?
I will also see whether I can setup a Windows 11 dev VM and duplicate the issue.