Hello Padraic,
This is what I tried:
1. I tried to install the filenavigator with no succes, I have the same error as with the installation of the Ext. Lib.
2. I made a backup of my workspace directory, then I restarted notes and a new workspace directory was generated. Then I tried again to install the Ext. Lib. but with no success. Still the same problem.
3. I backuped my names.nsf and my desktop8.ndk. Then I did an uninstall of Notes. I rebooted my machine, then I runned a regcleaner just to make sure there is nothing left in the reg. of windows. I installed 8.5.3. again and then I tried to install the Ext. Lib. again. No success, the same error.
4. I uninstalled Notes, deleted my datadirectory also, deleted my virusscanner (AVG) and rebooted my machine. I installed 8.5.3. again and tried to install the Ext. Lib. No success still the same problem.
I'm out of options now I hope you can help. I attached the logfiles from both before and after the new installation.
Kind Regards,
Martin