This does not sound like a Reaper webpage issue, but it DOES sound like what is known as a redirect virus or trojan. I suggest installing and running the free
Malwarebytes and run that first. If you are not computer savvy and Malwarebytes finds something, don't remove it before you post back. MBAM is the greatest (I am a part-time geek as one of my non-musical side-jobs) but can be a bit zealous with what it wants to remove.
HERE is a working download link for Reaper, too. Let me know if that works. It works for me.