Choose which set you'd like to download, and what format you'd like it. The PDFs do not have bleed, and are typically meant for printing at home or places like Office Depot. The ZIPs are individual images with bleed, and intended for professionally printed cards.
Bleed is extra area added around the card that is cut off during professional printing on to cards.

Looking for tips on how to print these? There's a guide for that!

OCTGN & Mods
OCTGN is free to download on their website. Transformers.cards has its own mod for OCTGN which includes all cards on Transformers.cards, including community sets. The feed is https://www.myget.org/F/teletraan but if you need help setting things up, Transformers.cards has an OCTGN guide.

Tabletop Simulator & Mods
Tabletop Simulator can be bought & downloaded from Steam.
Once you have Tabletop Simulator installed, you'll want to download two mods.
• Transformers TCG The Card Game: This is the mod people use to actually play the game:
• Transformers TCG Deck Building: Maintained by Veral, this is for those who want to build/edit their deck within TTS itself.
If you need help with any of these, Transformers.cards has a TTS guide.