ZTERM is confirmed to work fine with Windows 8, and to work exactly--as far as we can tell--as it does with Windows 7.
This includes the licensing and registration steps, repeated here:
1. Install ZTERM as you would install any PC program; no special steps required.
2. When it comes times to enter the ZTERM license code, you must run ZTERM "As Administrator." This is normally done by RIGHT-clicking on the program's icon, instead of the normal left double-click.
3. Make sure you do NOT check the "confirm license with server" box on the license screen.
Please see the topic in this forum called "ZTERM w/ Windows 7?" for more information.