Do I need to repurchase plugin after change of device (smartphone, tablet)?

Ref No. FAQ-A16

Android
When you purchase, plugins are linked to your Google account. If the new device also uses the Google account to which the purchase was made and the e-mail associated with it has not changed, then all purchased plugins can be restored on the new device (see “How to restore purchases?”)

iOS
When you purchase, plugins are linked to your Apple ID. If the new device also uses the Apple ID to which the purchase was made, then all purchased plugins can be restored on the new device (see ““How to restore purchases?”)

Attention! Please note that plugins can be restored only through the application store from which the application was installed (for example, plugins purchased in an application installed from Google Play cannot be restored in an application installed from the App Store / AppGallery and vice versa).