Follow these steps:
1: Shut down AdVenture Capitalist [If open];
2: Shut down Steam [You could try just open steam on offline mode, works with me];
3: Shut down your Internet (Cable, Wi-Fi or both) [may not be needed];
4: Open Steam on offline mode;
5: Change the date and time on your computer to the far back you can (Here is 01/01/1980 - Windows 10);
6: Open AdVenture Capitalist, see you business and then close it;
7: Change the date and time on your computer to 01/01/2038 (more than this, the game don't opened here);
8: Open AdVenture Capitalist (58 years of money here)
9: Close AdVenture Capitalist and repeat step 5;
Do it how many times you want. After you get tired of doing it, put everything back to normal and be happy.