I'm upload updates. Try update packages and see if it solve problem.
I will update curl now to newest. Try to see if it helps
Yes, pacman linked with libcurl and use it to download packages.
As workaround try rename part file after 100% downloading - remove ".part" from the...
Is it still relevant?
mingw-w64-i686-glib2 g_fopen mode
Fixed in 2.41.2-1