quick PowerShell script job

Job ID: 35084504

Budget: £10 – £20 GBP

Hi,
I got a short PS script that updates git version (I think), unfortunately I don't know PS.
I need someone who knows PS to help me establish answers to basic questions related to this code:

What is this code attempting to achieve (or better yet, write comments to explain what certain parts of it do)?
What needs to be done to fix it?
What, if anything, can be done or changed in order to achieve a 'better' solution?

Any help appreciated
Related categories: Git Powershell