Downloading installation files failed while updating to easyblog 5.0

Hi guys,

I was trying to update my easyblog version from 3.9 to 5 and was following the instructions on:
http://stackideas.com/docs/easyblog/administrators/upgrades/upgrade-easyblog-3-9-to-easyblog-5

Even so the requirements were all fine and good to go to the next step the installation failed due to the fact that "downloading installation files" failed. After that, my frontend and backend weren't available anymore (I don't recall the error message anymore but something in linie ... was missing).

I made a backup of my ftp data as well as my data base before the upgrade so I reloaded the ftp data until my frontend was looking presentable again.

Today I noticed that the easyblog menu in the backend has broken links going to 404 pages.

Can you advise what would be the best way to get a clear easyblog version again? Should I reload all ftp data as well as the database?
And do you know what might gone wrong with the installation of version 5? I was trying to use the installation via network method.

Thanks in advance & best Nick