UPDATE: HttpWatch 9.3 now fully supports IE 11 on Windows 8.1 including Enhanced Protected Mode (EPM). Please refer to HttpWatch Supports 64-bit and EPM .

HttpWatch 9.1 is now available for download and adds support for IE 11 on Windows 7, 8, and 8.1:

If your HttpWatch Professional license key allows access to version 9.x you can simply download and run the latest setup program to get the update.

SPDY is disabled while HttpWatch is recording

Another limitation of HttpWatch on Windows 8.1 is that it currently does not support the SPDY protocol in IE 11 even though it is enabled by default:

While HttpWatch is recording any potential SPDY connections are downgraded to ordinary SSL/HTTPS connections. Again this limitation will be addressed in a future update to HttpWatch.