I have WebCore 1.5.6. but I don;t have live preview capability. It is missing from the right-click menu on the unit file and is not available on the toolbar. Delphi 10.4.1
Are you 100% sure you have 10.5.6.0 installed?
Did you verify the version installed in the IDE via the menu Help, About TMS WEB Core?
Well I installed 1.5.6 (multiple times) but it turns out I wasn't running that version. I had installed 1.4 in Delphi 10.2 and 10.3. I then installed 1.5.6 in Delphi 10.3 and 10.4 but 1.4 was still installed in 10.2. When I looked at the WebCore about in 10.4 it was 1.4. So I uninstalled all versions and then reinstalled 1.5.6 and now it is working. Thanks.