1. Save the file, then find it in your Downloads folder. It is about 120MB.
2. Right-click it and choose "Extract All". If you open the zip and double-click the app inside it, Windows copies out only that one file and the app will not start. It needs everything in the folder.
3. Move the extracted folder into your user folder — the one holding Documents and Downloads, so the path ends up like C:\Users\yourname\HossTrain Member. Not Downloads itself, which people empty, and not the root of your C: drive: Windows protects that, and the app needs to be able to replace its own folder when it updates itself.
4. Open the folder and run HossTrain_Member_app.exe.
5. Windows will warn you that it protected your PC. Click More info, then Run anyway. This is expected: the app is not code-signed yet, which is a certificate your school's software provider buys rather than anything about the app itself.
6. For an icon on your desktop: right-click HossTrain_Member_app.exe, choose Show more options on Windows 11, then Send to → Desktop (create shortcut).

There is no installer yet, so the app lives in that folder. To remove it, delete the folder.