Had V10 SP6 installed on Win 7 Pro machine Sp1 with plenty of power and memory. I decided to try the Beta and backed up V10, unstalled it and then proceeded with the V11 install. Unfortunately, it appears that the installer does the file extraction and then checks the target machine before actually commencing with the file installation. In my case, the checking resulted in an error "specified port already in use: 5000". Looking at netstat I see where the local address 0.0.0.0 and foreign address 0.0.0.0 are listening to TCP port 5000, but the process owner is the "system'. Similarly, it also shows local [ : : ]:5000, foreign [ : : ]:0 with the system again being the process owner. These are the only 2 entries with 5000 as the port number. I have tried a number of things to include disabling uPnP services, disabling the NIC, diabling port forwarding in the router and more, but all to no avail and I now find myself unable to reinstall V10 as its installer gives the same error. I have a request into Support, but was hopeful that someone else had run into (and fixed) the same issue as I am pretty much dead in the water. Virtually anything and everything I had on the system related to 3CX is removed - MyPhone, Hotel module, Softphone, directories, registry entries, etc. System event log shows nothing other than same error code. Any and all suggestions appreciated.