How to write proper if statement based on values in all column?

[jacek_k]

My data:

ID	Date	Version	newColumn
1	1.01.2019	1	2.01.2019
1	2.01.2019	2	2.01.2019

What functions I need to use to achive:
1. Take max version for the same ID

2. Add Date 2.01.2019 to all rows.