This is not an eric issue but caused by the operating system. There are two possibilities
I am aware of.
1. There seems to be a Windows configuration to disable the path length limit of 256
chracters. Unfortunately I don't know which one it is.
2. Create a Python virtual environment (e.g. C:\Users\David\eric_env) and install eic in
there. This has the advantage, that you can have different versions of Python and/or the
packages (like PyQt5) on your system. Details about this may be found on the eric web