Keep in mind that the Nintendo 3DS is region-locked . A European (EU) copy of the game will only play on a European 3DS console unless the console has been modified.
Since digital downloads are no longer available through official Nintendo channels, here is how you can still enjoy the game: Download Harvest Moon 3D: A New Beginning (EU) ...
To play , your best legal option is to find a physical copy, as the Nintendo 3DS eShop was officially closed in March 2023. Keep in mind that the Nintendo 3DS is region-locked
Check for any "Nintendo Selects" versions which were released later and are often more affordable on the secondhand market. Do you have a European 3DS console , or Download Harvest Moon 3D: A New Beginning (EU) ...