[tryauuum]

Probably nothing

My concern was "what if file is updated while it's mid-download" but Linux would probably keep the old version of the file until the download finishes (== until file is still open by webserver process). Probably. It's better to test

[tbrownaw]

Is it updated in place (open/write), or replaced (rename)?

If it's updated in place, did the web server read the whole thing into a buffer or is it doing read/send in a loop?