Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Sami,
Thanks for letting us know you have Office 2011 for Mac and had issue with Office 2011 for Mac on Mac Catalina.
I recommend you refer to Jim's suggestion in this similar threads:
Where can I download the Office 2011 installer(the last reply by Jim)
Apple does not allow Office 2011 to run in Catalina
I will also help you move this thread to Office 2011 for Mac category to make sure you get the dedicated assistance.
@BADAL KUMAR JAISH,
You may check the information in article below about install and update Office on Windows:
Download and install or reinstall Office 365 or Office 2019 on a PC
Besides, as this thread focuses on issue for Office on Mac, if you need further assistance, please create a new thread about your question, we will focus on it and help you further.
Doing this will also help other community members having the same question seek out the thread quickly.
Thanks for your understanding and patience.
Best regards,
Tina