How to install Synapse for free?

Could you please guide me through the process of installing Synapse for free? I'm a bit unfamiliar with the steps involved and would appreciate it if you could break it down in a simple, easy-to-follow manner. Are there any prerequisites or special software that I need to have installed on my device before I can proceed with the installation? Additionally, are there any known issues or potential challenges that I should be aware of during the installation process? Thank you for your help!