Unable to get old dependency package after studio upgrade

I developed a program in studio 2020.10.6, when the studio upgrade automatically to 2021.xx.xx,when i open the program , it reports error :
The feed ‘https://www.myget.org/F/workflow/ [https://www.myget.org/F/workflow/]’ lists package ‘UiPath.System.Activities.20.10.4’ but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again.

Can you check on this, also try a manual install
Install-Package UiPath.System.Activities -Version 20.10.4 -Source https://www.myget.org/F/workflow/api/v3/index.json

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the dependency package can be loaded when i try several times, but I don’t know the reason. If I encounter this problem again, I’ll try your way . Thank you

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Sure. Hope it will helps you in future