usermodules

I created a user commentary. All was well over the years, a few sermons ( 20-30 ) in there. I could edit all seems fine. Then I created a Book called My Sermons and kept more sermons (about 20) there. Now my question is the Books called My Sermons are fine. I can edit them the icon pencil is...

I have several files in my SwordSearcherUserModules folder that have .download file extension. The modified date on most of those are different (older) than the corresponding .ss5book or .ss5cmty file. Is it okay to delete the .download files?