Please try this solution :https://forum.mendix.com/link/space/studio-pro/questions/121958
It’s a HTTP forbidden error. If you’re on an office pc, you must check if your have the right to download something on the Mendix website. If you still have a problem, create a ticket for the Mendix support.
Hi, please check this guide for Installation Offline: https://docs.mendix.com/refguide/install/#offline
Thank you all for the support, the error occurred was due to some restriction put by my company which were resolved after proper access permissions.