Wut does it mean if it says that limewire was unable to find a license for a file?

It means you've chosen not to download files that aren't licensed. If you want to download, you'll have to change your answer within the popup. Lots of info here
License

but how do i find the license for the downloads

If there is no license then there is no license and therefore if it is copyrighted it is protected. Click on the link birdy left you their is some info in there. Click on birdy's link where the letters License are blue.

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A little common sense goes a long way

Later Grandpa