MiKTeX’s Secret: Local Package Repository
The error in the installation of LaTeX packages from a local package repository on MiKTeX might be:
“…. does not seem to be a local package repository”.
The problem can be solved by downloading “readme.txt”, “miktex-zzdb1.cab”, and “miktex-zzdb2.cab” into the folder that contains the LaTeX packages you wish to install.