Here are the links to download the app.
TexAu Windows App:
Make sure to select "Only for me" while installing it in Windows.
TexAu Mac App:
Mac app requires one extra step, only in case, if you are not able to open the app. Please check this guide: https://support.texau.com/en/articles/4682030-how-to-setup-texau-desktop-app-in-mac-os
Hope this helps.
In case if you're still experiencing any issues, please reach out to support and we will get things fixed for you right away :)