Lucas,
I am afraid xHarbour.com is a failed company. It does still offer a compiler compiled with Pelles, no 64 bits version, no support... It is mainly runned by Patrick Mast.
But what I want to share is that our company purchased SQLRDD a couple of years before. We had several issues and we did not get a reply from Patrick. We sent many many emails but not reply. We quit SQLRDD.
He is not a serious busssiness man. And, in some kind, the product is a scam. It is very evident in the experience shared by Lucas that he does not provide a working demo and he does not reply the mails too.
The best tip to do with SQLRDD from xHarbour.com and Patrick Mast is just ignore it. Very soon the site will close.
Opposite, we always get very good support from Fivetech with our FTDN.
My two cents.