Waltzremote.com no longer works with Chrome, Edge or some other Chromium browsers.
Use a web browser not based on Chromium such as Firefox, Safari, etc.
Run Waltzremote on your own network. A virtual machine image is available. Instructions are here.
Waltzremote must contact your DVR using HTTP instead of HTTPS. Chromium
restricts access to sites starting with http:// on 'private' networks such as your home network. Evil websites can exploit such access as a security hole.
There is no way that Waltzremote can bypass this restriction.
Even if you can't use waltzremote.com to control your DVR, you may still want to use it to show you program listings.