Failed to install package 'xxxxx' when download package with robot

Hey! Guys, i need help
i have installed the orchestrator and studio on the same computer.
i’m able to publish a process to orchestrator , and the target process is editable with orchestartot , the process name can be got in robot,but when i tried to download the process ,i faced with this


I tried to change those config files (adding http_proxy)
1.Uipath.Service.Host.exe.config
2.Uipath.Executor.exe.config
3.NuGet.config
and uninstall uipath and restrart UipathService
but it still can’t be downloaded

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i also run the robot with user mode ,but still no use