Do I need to download Slack? Yes, it is necessary to download Slack onto your computer in order to access quick and efficient communication. Slack is available for Apple and Windows. We also recommend downloading Slack for Apple and Android devices. Related articles How do I get added to my company's chat on Slack? How do I attend the training session? What is a CRM? What is Slack? I am already a dedicated Expert and I picked up additional messages on-demand. How would this reflect in paycheck?