Latest Tsc Update - System Space Required 6gb!?

Hi Folks
Today my Steam account has pushed a TSC Update for Train Simulator Classic requiring 6GB of memory space. Does anyone know exactly why/how so much fresh hard drive space is being taken please? Some of us are running very close to maximum memory and being forced to manually copy assets between C: drive and archive so another big memory grab is extremely unwelcome.

Is there a log of the update contents anywhere that we can check in advance?

 

I have had no update. Presumably then it's for DLC, not core.

 

If you are that close to your storage limit, i strongly advise you to upgrade your storage. Running that close to full is not really good for the hd/ssd

 

Thanks, yes I’m aware. Unfortunately will require a new motherboard in my case so not an easy option.

 

There was an update for the Wessex Main Line: Southampton - Salisbury Extension

 

Why would you need a new mother board to add memory?