If you had purchased using store.appline.xyz or appline.store (former shop.yuuta.moe), you should follow this guide to activate your copy.
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Login to your store.appline.xyz/my-account account.
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Go to
Orders -
Find your Dir order, then click on
View -
Scroll down to bottom, copy the
serial number -
Open Dir, go to settings, unlock full version, and click on
Activate -
Type your email used to login store.appline.xyz or appline.store, and your serial number.
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Click on
Activate -
Your copy is now activated.
Note: Only Dir 2.0 and later versions support this method.
If you have other questions, take a look at Activate FAQ