Hello @SpottedMule4! the Small Trees mod is an official mod developed by the AoE Official account.
Follow these in-game steps:
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Press in "MODS"
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Press the second tab to "Browse Mods"
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Enter the name of the mod or the name of the author of the said mod (in this case: AoE Official)
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Select the mod you are looking for and press the button to “Subscribe” (second option on the bottom). This button will change to “Downloading”
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Once the download and the whole process is done: You can enjoy your new mod!
These steps will be the same for any other mod you could want to download (as Zetnus Improved Grid, Night Edition Main Menu, Classic Intro, Mod Campaigns…)
PS: If you ever want to disable them or “Unsuscribe” because you don’t really want to keep them you just need to go to the “Installed Mods” tab and you can uncheck them to disable (you can do it one by one or you can Disable All with the button).
Good luck!