What I do notice about the torrent file I downloaded is, I had torrents set in settings to download to a non-system hard drive. Instead it downloaded to my account folder within a FrostWire Saved folder. So for some reason it's ignoring its own settings. Edit: probably because the downloads only are set to the other drive, but upon reinstallation it's changed shared location to default.
I copied FW (on macosx) to a different drive and when I re-opened FW, the torrent had gone from the download window but that's normal I think if the download has completed depending on your settings for Clear Downloads. The file is found in Library window under Shared Files and Torrents.

Go to Settings, Downloads, Clear Downloads & disable the option. You can do the same for Uploads.