Hi Harold Balaban,
Thanks for your post in Microsoft Community.
You might have missed a step; I suggest you follow the steps below to attempt to enable the Data Analysis ToolPak add-in again. Open the Excel application > File > Options > Add-ins > Find Analysis ToolPak > Do not click OK, go to Manage add-ins and click Go.
In the new window, check the box for Analysis ToolPak, and finally click OK.
A loading progress bar will appear at the bottom of the Excel application.
Once it's loaded, you should be able to find the Data Analysis button under the Data tab in the Ribbon.
I hope the information above is helpful to you, and I look forward to your reply!
Best Regards,
Thomas C - MSFT | Microsoft Community Support Specialist