Hello, the "No Overlay" option should be available in version 10.10. Perhaps there was an issue with the version downloaded. I have just re-uploaded the installer to sensel.com/start, refreshed our site cache, and tested to confirm the new version.
Could you try:
1. Uninstalling SenselApp using the Add/Remove Programs
2. Go to sensel.com/start and download a fresh copy of the installer (you can also directly download from http://sensel.com/release/new/SenselApp0.10.10.exe).
3. Install this version
Please let me know if you continue to have issues. Thank you for your patience.