You will find many web horror-stories with the Uniblue products. Some discussion here on DonationCoder. Overall, the company is a leading proponent of scareware for their registry cleaner garbage. (Yes, they inherited some decent software many years back through a purchase, most of the better stuff has been dormant or dropped.)
Uniblue works heavily through affiliates -- (the affiliates tend to scam through google ads) so be aware of that when reading various techie articles and reviews .. check first if they are an affiliate (we gave a few examples on Web of Trust of Uniblue affiliates shilling for the software). There is a lot of shill disinformation in the articles and ads, you cannot trust any quotes or references without doing a lot of checking.
One trick would be to have one program try to push another .. thus a free quite dubious "Speedup" program can be a wedge for popups or scareware methods to foist the dangerous registry cleaner (caution: maybe with automatic recurring billing, common in the registry sham-scam industry, always check) on the unwary.
Caveat emptor. Even when free.
I appreciate for-free-on-internet a bunch, and have spoken up for them on WOT. This one I consider simply an error.
BlackViper & Advanced SystemCare & Glary Utilities are mentioned in the 4-free thread, all fine, except be careful of any registry cleaner, use with great caution, item by item, if at all.