This is a terribly difficult question, and the answer is… no, you can’t.
I was thinking about it a lot, and technically “instalments” are like a loan, and I don’t want you to get in debt (at all), not to mention getting in debt to buy my course!
If you can save up some money each month (instead of paying an instalment on my course)… then please do. And when you will have all the required money, you will be able to buy the course, or do something else with them.
Loans are bad for you… don’t get them if you don’t have to!