Problem installing Keepass Plug-In

Hi,

I'm trying to install the Keepass Plug-In, but I was not successful till now.
I'm running a Windows 8 x64 PC with the Remote Desktop Manager Version 8.0.12.0 and Keepass Version 2.20.1

When I try to install the Plug-in via the procedure I found on the website, I get following error:

The KeePass application directory seems to be read only.
Please close the KeePass application if necessary.

I'm running as a local admin on the PC, and the directory is readwrite for the admin.

In another article on this forum I found some dll.s to copy to the Keepass directory.
I did, and now Keepass is seeing the Plug-in from his side.

When I now try to reach the Keepass from RemoteDesktopManager, it tells me

Keepass Plug-in is out of date.

Where can I find the latest version of those DLL's ?

Regards
Kurt