You can find your previously downloaded icons via the Downloads tab in the upper right hand corner next to your avatar, as shown in the screenshot below. The Downloads tab stores all downloaded icons.
When you bookmark an icon they will appear in the Collections tab which is also shown in the screenshot below.
The Purchases 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