FYI,

I just merged in a change to provide better backup support for the downloads.dat file. It goes through the following steps:

Before writing downloads.dat, rename the existing one to downloads.bak. If writing the file fails at any time, delete the current downloads.dat and copy the old downloads.bak to downloads.dat.

When starting up, if reading the downloads.dat file fails for any reason, it will try to read downloads.bak. If that succeeds, it will copy downloads.bak to downloads.dat.