Installation:

Windows - Double-click on the downloaded file setup_cppsim5.exe
(See note below on also installing Microsoft Visual C++ 2008 Redistributable Package)
Mac OS - Double-click on the downloaded file CppSimMacInstall.dmg
(For Ngspice, also install XQuartz: see xquartz.org webpage)
Linux - Extract the downloaded file cppsim_linux_install.tar.gz and update .bashrc file
(You must also have Tcl/Tk, Wine, zlib, and g++ compiler installed on your system)

For all of the above, read the CppSim/VppSim Primer found on the Manuals web page for more detailed installation instructions.

After Installation:

Read the CppSim/VppSim Primer found on the Manuals web page, and look through the FAQ page for additional information.

Windows Note:

For the Windows version of CppSim, some computers require installation of the Microsoft Visual C++ 2008 Redistributable Package (x86) in order to run NGspice. This is a small set of DLL files, and can be downloaded and installed directly from Microsoft's website at:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=29

MacOS Note:

After install, you'll need to run the following commands in Terminal:
sudo xattr -rds com.apple.quarantine /Applications/CppSimView.app
sudo xattr -rds com.apple.quarantine /Applications/PllDesign.app
sudo xattr -rds com.apple.quarantine ~/CppSim

Beta Viewer Option for MacOS (MacOs Application Bundle for Apple Silicon Only):

Download the following file, unzip, and place in /Applications:
CppSimPyView.zip (90MB)
After placing in /Applications, you'll need to run the following command in Terminal:
sudo xattr -rds com.apple.quarantine /Applications/CppSimPyView.app

Beta Viewer Option for MacOS (Python Script):

Download the following file, place in any folder, and unzip:
CppSimPyView_script.zip (37kB)
Within the CppSimView_script folder, run the following command in Terminal:
python3 CppSimPyView.py
Note: you may need to recompile cppsimdata_lib.c --- see README file for instructions