Confirm the build and mode
Use the download offered for your assignment. Check whether it requests Desktop or Tray and choose the matching operating-system build. The help centre lists no Linux or Windows 32-bit app. Do not substitute a similarly named download.
“Open in App” does nothing
Make sure the correct app has finished installing.
Open it manually, then return to the browser and select Open in App again.
If the browser asks to open the installed TrustExam app, allow that handoff.
The troubleshooting guide also describes copying the generated launch link from the blank tab to the clipboard, then opening the app manually. Treat that link as private; do not paste it into a support message or another website.
The operating system blocks launch
Save the exact message and ask support to verify the installer and expected publisher. On an organisation-managed computer, involve IT. Do not turn off system-wide protections or run an unverified build to get past the warning.
The app opens but checks fail
Confirm camera, microphone and screen-recording access for the app itself. Browser permissions do not automatically grant app permissions. If an exam is already timed, agree recovery with support before restarting or reinstalling.