1. Install.

2. Create a worksheet and open it, load Macabacus at least for once, then quit when you get account / activation dialog. Click cancel and quit worksheet.

3. Modify the hosts with the following:

0.0.0.0 macabacus.com

4. I used offline in my case, you can block the above line to stay safe and prevent calling home.

5. Merge the supplied reg entry.

6. Account / activation nag will be gone. Trial days in about tab will get stuck at "0" and it will always stay there without any expiration.

7. Tested on Excel 2013 and 2016 by setting system clock couple of years ahead with no problems.