It looks like you are running Skyline from C:\Program Files\Skyline\SkylineCmd.exe
This is where the administrator installer puts Skyline and based on this message, you must still have Skyline 4.1 in this location (which because of a mistake during its release supports the document format version 3.73). The message is also consistent with your assertion that you are using 188.8.131.5205 to create the Skyline document you are trying to open (since 4.2.x will produce a 4.2 format document).
To fix this issue, you should use the latest administrator installer to update the Skyline version under "Program Files".
Thanks for your clear description and the log file.