I was able to open and view the files you linked in both the project explorer and the main window. I am running the latest build of GMS, 10.4.1. Let me know if re-installing GMS changes anything for you. You can have both versions 10.4 and 10.3 installed and running at the same time. The exception is that you cannot have, for example GMS 10.3.1 and 10.3.2 installed at the same time, it must be one or the other.
Feel free to send any questions over to Aquaveo's Technical Support Team at firstname.lastname@example.org.