Portico Plug-Ins don't work on Retina/Yosemite anymore!!!

Just installed Logic Pro X and Final Cut Pro under Yosemite 10.10.3 and find that the Portico Plugins are rejected.

From looking around the various pieces of information I can find on the Steinberg.net and this forum there appears two possible work arounds

1: Open a dmg archive and copy files to their location manually.
Can anyone clarify exactly what I have to do as when I open the dmg archive I see several files and not being familiar with the Mac OS its not clear to me what I would have to copy or to where?

2: Try and reinstall using the Steinberg App Installer under Yosemite
Has anyone tried this? Does it work?

Any help would be appreciated. Didn’t expect this problem on the upgrade given the cost of these plugins.

Cheers
David