I would like to ask if a five-year installment plan is available now.

If you want a loan, a five-year installment plan is also possible. Generally, it's a three-year plan. As for the down payment, 30%, 50%, or 70% are all acceptable. As long as you have good credit and bank statements, it's fine.

This is doable. Currently, car loans can go up to 5 years. It used to be 3 years, but later the loan policy was relaxed.