Nth string match and then delete following string and put a new string instead by sed

I have this file:

  "Max": 10,
  "Enable": true,
  "Min": 2,
  "Enable": true,
  "Retries": 5,

I want to change the second occurrence Enable value by deleting all after "Enable": and put the value I need. I don't care which value is right now in "Enable" just to replace even if I replace with the same string.

I used this command:

sed -re 's/("Enable":)[^:]/\1 false,/2' file > newfile

But the result I get:

  "Max": 10,
  "Enable": true,
  "Min": 2,
  "Enable": false,true,
  "Retries": 5,

I need it using sed command if it possible.

Thank you all!