When u=i try to run the command

conda install plyfile

in windows command prompt

Fetching package metadata ...........PackageNotFoundError: Package not found: '' Package missing in current win-64 channels:
- plyfileClose matches found; did you mean one of these?
plyfile: olefileYou can search for packages on anaconda.org with
anaconda search -t conda plyfile

I tried to use

pip install plyfile

and it executed without any error but it still won't show up in Anaconda.

Go into your Anaconda install folder

(default) C:\Program Files\Anaconda3\Scripts

there you should find PIP used by Anaconda, try running

pip install plyfile

from that location.