The latest Miranda app update clear all my plugins and settings to the default without backup.
I'm going to remove Liberkey at all after several years of use.

You're right, plugins, icons and themes (dlls) has been lost but hopefully, not your data and configuration !
My mistake, sorry !

Your previous profile would be still available here:
Apps\Miranda\Data\settings\<name of your previous profile>

In order to solve the issue, you have to copy again the plugins dll you used before (I hope you remind them...) and copy them into their corresponding folders :
Apps\Miranda\App\Miranda\Icons
Apps\Miranda\App\Miranda\Plugins


For instance, if you used tabsrmm plugin, you have to copy it like following :
- tabsrmm_icons.dll and toolbar_icons.dll into Icons folder
- tabsrmm.dll into Plugins folder

Usually, the way to install them is described in a file inside the plugin zip package (readme.txt)

Unfortunatelly, I can't fix the lks before tomorrow evening...

I finally tooked some time to release Miranda 0.10.11 rev1 which fix the update bug.