You got 4.5 IELTS band can you apply for study in any country?

It depends on the specific requirements of the educational institutions you are applying to. Some countries and universities may require a minimum IELTS score of 6.0 or higher, while others may accept a lower score. To ensure your eligibility, it is important to check the language proficiency requirements of the educational institutions you are interested in and make sure you meet or exceed them.