Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the highest Version, when Release Date is "2011-04-01"?

### Inputs:
table_name: table, columns: ['Title', 'Developer', 'Genre', 'Release date', 'Version']

### Response:
SELECT MAX Version FROM table WHERE Release date = 2011-04-01