Hi fábio0106,
We see you're having an issue with photos duplicating upon downloading them to your PC. We can certainly understand the need for it to just download each photo once. We'd be happy to help.
Are you downloading these photos from the iCloud website? Or are you using the iCloud Photos feature within the iCloud for Windows app? For details on the steps for the latter option, check out this page: Set up and use iCloud Photos on your Windows PC
1. Open File Explorer.
2. Click iCloud Photos in the Navigation pane. If you don’t see iCloud Photos, click Pictures in the Navigation pane, then double-click iCloud Photos.
3. Click the Notification area in the taskbar, then click Download Photos in the iCloud Photos notification. Choose the photos and videos you want to download by year.
There are some additional helpful tips, which may help to explain what you're encountering, on this page: If your iCloud Photos aren't loading on your PC
While the title of the page may not directly apply, scroll down to the "Why am I seeing duplicate photos?" section. This will help to note that in iCloud for Windows, you see both a video and a key still image for each Live Photo downloaded from iCloud Photos.
Please let us know the outcome after giving the above steps a try.
Thanks for using the Apple Support Communities.
Cheers!
