save the license file to your computer and then do this bit
"REAPER version 3.0+ can import a license key (.rk) file; your key file is attached to this email (named reaper_license.rk or similar). Please save this file and go to the REAPER about box, "Purchase" tab, and select "Import license key...". Find the saved .rk file and hit OK, and the license will be imported.
"
That's what I did to mine and it worked like a charm
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