I have the same issue. I installed the Console at one point with a trial. Uninstalled. Then reinstalled when I had purchased some business licenses.
It fails to install every time. I have emailed support back and forth and their replies are 3 days at a time and not very probing. Their latest suggestion is:
"avast SBC cannot connect to your SQL database.
Please remove existing sbc database or whole SQL Server Express server and run the installation once again."
I have uninstalled anything related to SQL, .net and C++ (twice). I have gone through the reinstall and it continues to fail.
Here is a chunk of my log that looks like it is the problem:
01-26 15:03:42,305 HttpAclInstaller - Removing reservation:
http://nicole-laptop:8731/01-26 15:03:42,330 HttpAclInstaller - Unable to remove URL ACL reservation
http://nicole-laptop:8731/01-26 15:03:42,330 HttpAclInstaller - Removing reservation:
https://nicole-laptop:8732/01-26 15:03:42,331 HttpAclInstaller - Unable to remove URL ACL reservation
https://nicole-laptop:8732/01-26 15:03:42,331 HttpAclInstaller - Removing reservation: http://+:8731/Design_Time_Addresses/Avast.Sbc.Service.Core/SbcConnectionPoint/
01-26 15:03:42,334 HttpAclInstaller - Unable to remove URL ACL reservation http://+:8731/Design_Time_Addresses/Avast.Sbc.Service.Core/SbcConnectionPoint/
01-26 15:03:42,334 HttpAclInstaller - Removing reservation: https://+:8732/Design_Time_Addresses/Avast.Sbc.Service.Core/SbcConnectionPoint/
01-26 15:03:42,334 HttpAclInstaller - Unable to remove URL ACL reservation https://+:8732/Design_Time_Addresses/Avast.Sbc.Service.Core/SbcConnectionPoint/
01-26 15:03:42,334 HttpAclInstaller - Removing reservation: http://+:8731/
01-26 15:03:42,335 HttpAclInstaller - Unable to remove URL ACL reservation http://+:8731/
01-26 15:03:42,335 HttpAclInstaller - Removing reservation: https://+:8732/
01-26 15:03:42,335 HttpAclInstaller - Unable to remove URL ACL reservation https://+:8732/
I'm not quite sure the next steps.