how can i install te new native connector? it is just a file not an extension-file 
Rename the downloaded file so it has â.oxtâ extension (extension-file-for-windows.oxt). The file should now be recognized as LibreOffice extension package that you can double click to install.
If that does not work, try to open Extension Manager from LibreOffice (Tools > Extension Manager), click the Add button and in the file selection dialog change the filter to show all files. Now select the downloaded file.
thanx, renaming the file to the oxt extention did the job!