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Download LX OS 3 for the Raspberry Pi 5 :}
The file isn't currently downloading as you read this.
1: Download
2: Extract the .7z
In linux and very recent versions of windows or MacOS, you can simply right-click and extract it. In the event that you're not able to extract it, you'll need to download 7-zip.
--3: Install it
Use the raspberry pi imager to flash the now unzipped .img file to a storage medium that your Pi can boot from.