these 2 derivations will be built:
  /nix/store/ar635qxrkfqq05aydc6v6p7mi96lpjq7-effects_cave_demo.zip.drv
  /nix/store/k17bg8wc9pi66v1zqnspzc3jyhsacar5-ue4demos-effects_cave_demo.drv
building '/nix/store/zd87pfsjn10pyrsh5vll0fw4zv2ahr6k-effects_cave_demo.zip.drv'
effects_cave_demo.zip> 
effects_cave_demo.zip> trying https://ludios.org/mirror/ue4demos/effects_cave_demo.zip
effects_cave_demo.zip>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
effects_cave_demo.zip>                                  Dload  Upload   Total   Spent    Left  Speed
effects_cave_demo.zip> 100  196M  100  196M    0     0  27.5M      0  0:00:07  0:00:07 --:--:-- 27.9M
building '/nix/store/k17bg8wc9pi66v1zqnspzc3jyhsacar5-ue4demos-effects_cave_demo.drv'
ue4demos-effects_cave_demo> Archive:  /nix/store/f3x7l7qyzvhymjm706bhk5pyfijkk2g4-effects_cave_demo.zip
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Effects/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Effects/Content/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Effects/Content/Paks/
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Effects/Content/Paks/Effects-LinuxNoEditor.pak  
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Effects/Saved/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Effects/Saved/Config/
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Effects/Saved/Config/controller.vdf  
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Engine/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Engine/Binaries/
ue4demos-effects_cave_demo>    creating: Effects Cave Demo/Engine/Binaries/Linux/
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/Effects  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicudata.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicui18n.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicuio.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicule.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libiculx.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicutu.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libicuuc.so  
ue4demos-effects_cave_demo>   inflating: Effects Cave Demo/Engine/Binaries/Linux/libopenal.so.1  
ue4demos-effects_cave_demo> Effects Cave Demo

upload niks3: ok