An update from the last version we were given, the portable version is available from the download page at the KC Softwares site. The portable version will register or activate, and it stores that activation with the app so it remains activated. The portable version does however add a couple of files to C:\Users\ [UserName]\ AppData\ Roaming\ KC Softwares\ dot11Expert\, though it adds nothing to the registry.
I have used the software a couple of times, and it did what it's supposed to, but other than complaining about the WiFi congestion where we live, I don't do much concerning WiFi. NirSoft's free tools include some useful WiFi apps as well. nirsoft[.]net