Thank you PWIRED. You put me on the right track.
Although I couldn't figure out how to remote unzip the ProcessWire-master.zip file, is decided to give it another try and copied again all files (to another subdirectory).
Now the installation ran smoothly.
Conclusion: The installation process was halted because of missing or corrupted files. In this circumstance, an error message was not generated.
Thanks again for the help.
Leonarro
Leonarro's post in Install problems: no installation seems to happen was marked as the answer