[Question] Install/repair module manually in stable-diffusion-webui-forge

[andreiramani]

I try to install deoldify extension, but some of python package is missing.
Is it possible to install package manually in stable-diffusion-webui-forge ?
How do I activate stable-diffusion-webui-forge python environment folder?

--- example of error message ---
File "E:\gpt\sforge\webui\extensions\sd-webui-deoldify\fastai\imports\core.py", line 24, in
from fastprogress.fastprogress import MasterBar, ProgressBar
ModuleNotFoundError: No module named 'fastprogress'

Already try to gracefully terminated stable-diffusion-webui-forge, and run: pip install fastprogress
but still give me error:

Fatal error in launcher: Unable to create process using '"D:\webui-forge\system\python\python.exe" "E:\gpt\sforge\system\python\Scripts\pip.exe" install fastprogress': The system cannot find the file specified.