You can find your previously downloaded icons via the drop-down menu under Downloaded icons, as shown in the screenshot below. Here, you can find all previously downloaded icons.
When you bookmark an icon it will appear in your Collections which are also accessible from the dropdown menu as in the screenshot below.
The Purchased icons tab, which stores all your purchased icons, can be found via the drop-down menu which appears when you click on your avatar (see screenshot below).
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For how long can you use the icons downloaded from Iconfinder