Downloading to an older version
Hello. I need an older Mac software to work with one application. At the moment, I am running High Sierra. I need 10.2 version (I guess that's Sierra). Is there a safe place where I can download it? I only found it on Macworld and I am not sure if that is a safe version to install on my computer. Is there a possibility to run two versions (High Sierra and Sierra) on my Macbook Pro? If so, how do I do that?
Thank you in advance for your kind help.
MacBook Pro 13", macOS 10.13