K it's been reported amongst other helpers on the forums that the new LW version apparently creates a new download location. I don't have windows set up at moment so can't check to see what happens & how best to rectify it.
You have a few choices as suggested in my previous post. (a) Another is to revert to the old download location by going to Tools > Options > Saving & clicking browse button & change it back to your previous location. However, this will either affect your new or old downloads. I'd suggest you concentrate on your old ones. Go into the old incomoplete folder, make a copy of both the download.dat & download.bak & move them somewhere else. Then close LW after changing your download location as suggested. Then move the backed up copies of download.dat & .bak to the incomplete folder & replace the ones that are there. Thus keeping a record of your old downloads.
(b) Other alternative is the one in my previous post. Close LW, move all files from previous incomplete folder on C drive to the new one created after the update, & replace the download.dat & .bak files when requested to.

As for connection & speed issues, check my link above again. Disable the DHT in advanced settings. For windows this is found in Tools > Options > Advanced > Performance.

The DHT option seems to be a little buggy & I reported this to the LW programmers 6 months ago but one of them chose to be skeptical. It seems the problems it has have now surfaced more widely now with the newer version & changes to the gnutella network.