Can you only use the mods if you have premiums?
Welcome to the community. 
No, you do not need a Pro account to be able to use WeMod trainers.
If you are not a Pro user, you need to activate cheats using the keyboard hotkeys/shortcuts, as opposed to clicking them.
Activating cheats by clicking them is a Pro feature, as is activating cheats remotely via our WeMod remote app.
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