My downloads sometimes won't stop at 100%. They'll reach 100% but won't say completed. Sometimes they carry on and say 103% or more and the time remaining starts running as a negative figure!!

Can anybody help?

What can I do once a d/l reaches 100% to make it save the file?

First, use the latest version (old transfers should resume after the newer version is installed).

There was a problem like you mention, and I think it was fixed in a later release.

btw--LW will sometimes redownload part of a file if an earlier part was corrupt. That also may be what you are noticing.