Netflow plugin update problem

Hi, I've updated opmanager from 8810 to 8812 but I'm not able to update the netflow plugin from 8500 to 9000. The update process seems to not install any files and continue to run indefinitely (It run for about 1 hour without any reaction for the update window.

Checking on NetFlow directory I see a update.log file with some errors inside:
Unable to load Disk Space related native library.
Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: getFreeSpace
    at com.adventnet.tools.update.installer.DiskSpace.getFreeSpace(Native Method)
    at com.adventnet.tools.update.installer.ApplyPatch.run(ApplyPatch.java:152)
    at java.lang.Thread.run(Unknown Source)
Unable to load Disk Space related native library.
Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: getFreeSpace
    at com.adventnet.tools.update.installer.DiskSpace.getFreeSpace(Native Method)
    at com.adventnet.tools.update.installer.ApplyPatch.run(ApplyPatch.java:152)
    at java.lang.Thread.run(Unknown Source)
Unable to load Disk Space related native library.
Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: getFreeSpace
    at com.adventnet.tools.update.installer.DiskSpace.getFreeSpace(Native Method)
    at com.adventnet.tools.update.installer.ApplyPatch.run(ApplyPatch.java:152)
    at java.lang.Thread.run(Unknown Source)
Unable to load Disk Space related native library.
Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: getFreeSpace
    at com.adventnet.tools.update.installer.DiskSpace.getFreeSpace(Native Method)
    at com.adventnet.tools.update.installer.ApplyPatch.run(ApplyPatch.java:152)
    at java.lang.Thread.run(Unknown Source)

Any idea of what I can do?