Aisa search there is no provision of pain karnatak examination authority fees in installments. But I found some other information which I am mentioning below:

• If you belong to scheduled caste or Scheduled tribe  category and your family income is more than 10 lacs then for government college you are to pay 33810 and for aided college, you are required to pay 43810. (For Engineering and Architecture)
• If you belong to SNQ category, can you are required to pay 18220 for government college and 28220 for aided college.
• If you belong to scheduled caste or scheduled tribe  category and your family income is up to 2.50 lakh, then you are required to pay 500 for government colleges and 500 for aided colleges.

Read More about Karnataka Admission Authority Fees structure for different categories and according to different income for different courses:

https://www.google.com/url?sa=t&source=web&rct=j&url=http://kea.kar.nic.in/cet2020/R2/fees.pdf&ved=2ahUKEwjClJb7uYX1AhXRc3AKHbb2A-oQFnoECCwQAQ&usg=AOvVaw1QVW3-m_1_hjYOAXeuOojG