I just downloaded version 4.0.5... when I try to launch it it gets as far as "loading library window" then a box pops up and it says one or more necessary files appear to be invalid. this is generally caused by a corrupted installation. please try downloading and installing limewrie again (which I did). Is there a problem with this particular version? or is it something I can fix? Thanks. ~Danielle

Which OS do you have? That would help us w/troubleshooting solutions.
The following solutions are for the classic OS systems:

After downloading LW, rebuild your desktop using http://www.versiontracker.com/dyn/mo...]Techtool Lite.

If the above does not work, then try installing LW with extensions off, by restarting while holding down the shift key. This will shut off the extensions.
After LW is installed, then restart your comp to turn extensions back on again.
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If you are using Panther or Jaguar someone else will need to help you as I have no experience using the kitty cat systems.