Ok got the steam version got beta what else do I need to run Apollo pack?

[Rocketman1999!]

Brioche’s Apollo Saturn Pack gives an error cant’t deserialize error

 

[Mooncrasher]

Please read Mods and installation: Questions and answers

 

[Altaïr]

Brioche’s Apollo Saturn Pack gives an error cant’t deserialize error

In this case this is because the mod needs to be ported to the latest mod loader version.

It's still a good idea to read the thread given by Mooncrasher though

 

[Rocketman1999!]

In this case this is because the mod needs to be ported to the latest mod loader version.

It's still a good idea to read the thread given by Mooncrasher though

I’m still trying to find out what a pack file is! I read it before asking my previous question

 

[Mooncrasher]

It is simply a file with parts in it.
To take an example, I followed the link given in a mod thread and ended up in GitHub.

There are 2 files and 1 folder. For this custom parts pack, we just need to download the .pack file, put it into the folder indicated in the tutorial you read.
It's important to read the readme or other instructions included with a part pack to see if there are any special steps, like installing something else such as an electricity mod.