On hackspace.raspberrypi.com, identify the latest issue of HackSpace magazine. What is its issue number and main cover feature? Additionally, explain how to access free PDF versions of past issues of HackSpace magazine.
Navigate to 'hackspace.raspberrypi.com'. Identify the section displaying the latest issue of HackSpace magazine. Extract the issue number and the main cover feature of the latest issue. Locate the method or link for downloading free PDF versions of past issues. Synthesize the collected information into a concise answer.
State the latest issue number of HackSpace magazine. State the cover feature of the latest issue. Describe how to download free PDF versions of past issues (e.g., 'by clicking the 'Download PDF' button on each issue's page').