While I'm not against the idea of some sort of updater, I'd rather not having my Texture64 tool hosted externally. There is no reason that you cannot link to the officially hosted build on github:
https://github.com/queueRAM/Texture64/releases/download/v0.1.1/Texture64-v0.1.1.zip
Furthermore, for the tools that host releases on GitHub, you can easily use the
GitHub API to determine the latest released version. For example, the Texture64 releases API:
https://api.github.com/repos/queueRAM/Texture64/releases
Feel free to reach out to the developers to confirm they wouldn't mind their tools being included in your app and if they approve of your descriptions and screenshots.