[PC] Free Weekend (3 Games) - Battletech/Aftercharge/Terratech @ Steam Store

This is one of the free weekend deals. You will not get to keep the game in your library but instead have the option of buying the game at 40% off (ends on 26 February 2019, presumably US time).
You can use the free weekend to try the game to see if you like it - with some games the time is enough to finish their single player campaign although I have no idea whether that is the case here.
According to Steam the necessary space for Battletech is 35GB so I assume the download will be less than that.

Aftercharge: https://store.steampowered.com/app/492760/Aftercharge/
Download should be less than 5GB - this is a Multiplayer game only.

Terratech: https://store.steampowered.com/app/285920/TerraTech/
Download should be less than 1GB - Game has singleplayer and multiplayer.
Enjoy!