While Keat Pro and Kotak Stock Trading app won't be accessible after you switch to Neo, you will be able to access your account on Kotak Securities website (www.kotaksecurities.com) only for non-trading requirements and service requests.
NOTE: The login ID and password for the Kotak Neo mobile app and Kotak securities website (www.kotaksecurities.com) are different.
Enter your respective user ID and password for www.kotaksecurities.com and 'Do not enter the Access Code' after you have switched to Kotak Neo.
All your order and trade related activities can be accessed only from Kotak Neo mobile app or through Kotak Neo website (https://ntrade.kotaksecurities.com/Login).