Thank you all.
@RealMurphy yes there were all large green ticks on the initial page.
This really has me stumped.
I have tried different versions of Osclass, even osclass-evo but I can not get anything installed.
The problem is not the version of osclass but your current set-up as it seemingly mixes https and http resources on the same page which your browser does not like (for the obvious reason that private data may leak through one of the loaded http components).
Thus, at least for setting up, try setting your WEB_PATH to http:// localhost/ (minus the space) and then browse there and perform the setup locally. If this is installed on a remote machine and you cannot start your browser there *but* have the possibility to use ssh (putty may work, but I don't know much about this) to log into it, try ssh -L 8080:localhost:80 user@remote_box and then point your local browser to http:// localhost:8080/ (again, remove the space) where you should be able to connect to osclass and perform the initial installation just fine.
For the final deployment, you may need to change WEB_PATH to your https address and see if it works then. Can you elaborate on your set-up, i.e. directly listening to the internet, if you use proxy services inbetween, port forwarding, ....?