There was a download of RadLight 4 4.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Multimedia Tools, more precisely Players. This program is a product of RadLight.
The RadLight 4 installer is commonly called RadLight.exe or rlkernel.exe etc. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The most popular versions among the software users are 4.0 and 1.2.
From the developer:
RadLight 4 is the first true multimedia player that allows you to fully experience all kind of multimedia content such as DivX video or AAC/MP4 audio at the highest quality possible on the PC. RadLight 4 is the only all-in-one multimedia solution on the market to deliver all of this without being a resource hog or being too complicated.
You may want to check out more software, such as RadLight, which might be related to RadLight 4.