Update Bookly module of Wordpress site -- 2

Hi, I have a WordPress site. 1. I have an old version of Bookly and when I tried to upgrade it about 1 month ago, there were problems where the website data was messed up somehow - appointments/contacts were no longer showing, even though the data is there (I reverted the code and it worked again). I need someone to upgrade my website and make sure that everything is working after the upgrade. 2. Since then, I've developed some custom codes to fit with my business, and the codes are labelled with HL, so I need those custom codes to be merged to the upgraded module also. 3. I need the UI to be updated so that instead of all available times between time A and time B, I specify fixed slots for the booking and the user sees how many spots are left in the time slot. Example: [login to view URL] 4. I need the ability to add time slots outside of the regular work hours (for example, usually, we work 3-9 PM, but on certain days, we might want to work from 11 - 10 PM instead) 5. I also want people to pay different price, depending on the time/day they choose. 6. I would also like to specify different calendars for different services that should go on at the same time period. Items 1-4 are absolutely needed, while 5-6 is lower priority. Please let me know, thank you. To be considered, please put the latest Bookly version in your response.