these 2 derivations will be built:
  /nix/store/an292v7kks0p0ksqiafjkyccpc0c8z14-blueprint_examples_demo.zip.drv
  /nix/store/nqz2ns2744r3h5qsgxg7ikx3k1x1k9jd-ue4demos-blueprint_examples_demo.drv
building '/nix/store/m1j4r7lkq8iz9fpgz951aag2g9ha524d-blueprint_examples_demo.zip.drv'
blueprint_examples_demo.zip> 
blueprint_examples_demo.zip> trying https://ludios.org/mirror/ue4demos/blueprint_examples_demo.zip
blueprint_examples_demo.zip>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
blueprint_examples_demo.zip>                                  Dload  Upload   Total   Spent    Left  Speed
blueprint_examples_demo.zip> 100  200M  100  200M    0     0  40.3M      0  0:00:04  0:00:04 --:--:-- 41.2M
building '/nix/store/nqz2ns2744r3h5qsgxg7ikx3k1x1k9jd-ue4demos-blueprint_examples_demo.drv'
ue4demos-blueprint_examples_demo> Archive:  /nix/store/3hgpsyng6jrwf87w5zgcrf827flg9g36-blueprint_examples_demo.zip
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/BlueprintExamples/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/BlueprintExamples/Content/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/BlueprintExamples/Content/Paks/
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/BlueprintExamples/Content/Paks/BlueprintExamples-LinuxNoEditor.pak  
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/BlueprintExamples/Saved/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/BlueprintExamples/Saved/Config/
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/BlueprintExamples/Saved/Config/controller.vdf  
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/Engine/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/Engine/Binaries/
ue4demos-blueprint_examples_demo>    creating: Blueprint Examples Demo/Engine/Binaries/Linux/
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/BlueprintExamples  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicudata.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicui18n.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicuio.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicule.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libiculx.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicutu.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libicuuc.so  
ue4demos-blueprint_examples_demo>   inflating: Blueprint Examples Demo/Engine/Binaries/Linux/libopenal.so.1  
ue4demos-blueprint_examples_demo> Blueprint Examples Demo

upload niks3: ok