Programming Howto:Install Prerequisites
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TortoiseSVN
Download the TortoiseSVN installer from tortoisesvn.net.
Run the installer:

Don't forget to install command line client tools:

Click "Finish" to dismiss the installer dialog:

CMake
Download the CMake installer from cmake.org.
Run the installer:

Choose "Add to path for all users":

Click "Finish" to dismiss the installer dialog:

VisualStudio
Download the VisualStudio Community installer from visualstudio.com.
Run the installer:

Make sure to install the C++ compiler:

Qt
Download the Qt open source installer from www.qt.io.
Use the "go open source" link to download a version of qt available for open source software:
Download the Qt online installer:
Run the installer:

If you do not already have an account, follow the steps to create one:
Agree to the open source obligations, and click "Next" to continue:
Click "Next" to start the installation:

Choose a directory, and click "Next" to continue:

Choose a Qt version that is consistent with the version of VisualStudio you downloaded earlier. Note that VisualStudio 2017 is binary compatible with VisualStudio 2015, so you may use the MSVC2015 32-bit package for a 32bit build using VisualStudio 2017. BCI2000 does not currently support Qt 6.0.0 and above.

Agree to the License Agreement, and click "Next" to continue:

Click "Next" when prompted for Start Menu shortcuts:

Click "Install" to download and install Qt files:

Progress will be indicated during installation.

Installation may take a long time.

Uncheck "Launch Qt Creator" before clicking "Finish":

Next step
As a next step, learn how to register with the BCI2000 Project.