Launcher stops downloading Marketplace content exactly after 25 seconds

Launcher version: 1.5.1

Engine version: 4.4.0 Preview

Engine compiled from Github.

UAC Enabled

I have this weird issue that downloading automatically stops exactly after 25 seconds. I always have to select Download again and again to redownload and it stops after 25 seconds. Please help me to fix this issue.

After 25 seconds:

Restarting PC fixed this issue.