Outlook is not required to convert an ICS file to PDF. Although ICS files are commonly associated with Outlook calendars, they are not dependent on Outlook for conversion. You can use a dedicated ICS conversion tool that reads the calendar data directly.

With MailConverterTools ICS Converter, users can add ICS files, preview the calendar events, and export them into a PDF format without installing or opening Outlook. This makes the process quick and easy, especially for users who don’t rely on Outlook.
Read more: https://www.mailconvertertools.com/ics-file-converter/