Hello Skubas,
If you want to be able to access your iCloud Calendar on a Windows computer, using iCloud for Windows would be helpful.
Please check out this page, which explains how to set up and use iCloud for Windows and outlines the requirements: Set up and use iCloud for Windows
"1. Check that you meet the minimum system requirements
Make sure that you're using the latest version of Windows on your PC, and the latest version of iOS, iPadOS, or macOS on your iPhone, iPad, iPod touch, or Mac.
Check that you meet the iCloud recommended system requirements for PC.
iCloud might not be available in all areas and features vary. iCloud for Windows doesn't support Managed Apple IDs.
2. Download iCloud for Windows
Download iCloud for Windows on your PC. Then enter your Apple ID to sign in to iCloud.
Learn how to download iCloud for Windows on your PC.
3. Set up and use iCloud for Windows
Choose the features and content that you want to keep up to date across your devices. This includes iCloud Drive, iCloud Photos, Mail, Contacts and Calendars, Bookmarks, and iCloud Passwords. Then click Apply.
Learn how to set up and use all the different iCloud features with the iCloud for Windows User Guide."
If you're able to set up iCloud for Windows, please check out this link for the process to set up iCloud for Calendar on all your devices: Set up iCloud for Calendar on all your devices
Set up iCloud for Calendar on your Windows computer
See Set up iCloud Mail, Contacts, and Calendar in Outlook on your Windows computer in the iCloud for Windows User Guide.
If you’re having trouble with iCloud calendars in Outlook, see the Apple Support article If you can’t add iCloud Calendars, Mail, or Contacts to Outlook.
If you're unable to access iCloud for Windows, you may wish to contact your company administrator for assistance.
Thanks!
