This document is a set of instructions as to how to install custom packages such as custom classes (.cls) and stylesheet (.sty files).

1. Create a custom folder anywhere. This file will be used to add all custom packages. Let's say we call it packages and we store it in the directory C:\textbackslash packages}
2. Inside this custom folder, create {another} folder specifically called tex. So, now we have C:\packages\tex.
3. Inside the tex directory, create another folder specifically called latex. So, now we have C:\packages\tex\latex.
4. Now, inside this directory, you can dump the folders of the custom packages. That is, the new directory is now C:\packages\tex\latex\[customPackage], where the stylesheets and classes live inside the [customPackage] folder.
5. Open MikTex and update the packages.
6. To update a package, after updating it, open the command window and type texhash.
7. Run the command mktexlsr.

Checkout https://tex.stackexchange.com/questions/2063/how-can-i-manually-install-a-package-on-miktex-windows for reference.

On linux

Installation script

The install.sh script can be used to install the TeX classes and stylesheets into the latex search path.

To use it, run the following from anywhere on the system

wget -c https://raw.githubusercontent.com/aalbaali/latex_classes/master/install.sh?token=GHSAT0AAAAAABRI2OOT3SC4C7IOHDIQJ5K4YQRPABA -O install_tex.sh
chmod +x install_tex.sh
./install_tex.sh
rm install_tex.sh

Manually installing

I followed the instructions from this link.

Here are the summarized instructions

1. Type kpsewhich -var-value TEXMFHOME to get the latex search path. It looks something like /hom/aalbaali/texmf. Note that this directory may not exist (may not be created).
2. Add your folders (.cls and .sty) into /home/aalbaali/texmf/tex/latex/[package-name]/. Create the necessary directories if necessary.
3. From within that directory, run texhash . (or from anywhere type texhassh /home/aalbaali/texmf/tex/latex).

Verifying the installation

To verify the installation, run the following command from anywhere on the system

kpsewhich <filename-with-extension>
# Example:
#   kpsewhich amro-common.sty