Try the open-source Magpie tool on GitHub if you need a free solution immediately, or wait for a Steam sale if you want the specific stability and ease of use of Lossless Scaling.
To ensure your system stays safe and you receive all future updates, use these official storefronts: Lossless Scaling Price History - IsThereAnyDeal
Downloading a cracked version of Lossless Scaling 2.9 from unofficial sites is risky:
Buy it through Steam for a small, one-time fee.