I'm currently on a Windows 10 and after downloading my finished After Effects project, it said that the file couldn't be reached (as shown in the video above).
I forgot to add, I used my Media Encoder for this process, which is why I'm posting this under Media Encoder.
Can you attempt to export to your desktop and see if you experience the same issue?
This does not look ideal. Does it happen with every project? Also, did you try changing the export location as suggested by the expert above?
Let us know.
We'll look into this.