VideoProc Converter is one of many similar video converters developed by companies in China that focus on ease of use, something often missing in alternatives like the free XMedia Recode, which in balance often offer more control over encoding settings. Most all video converters use the free FFmpeg code libraries, so in theory results using the same encoding settings should generally be equal in quality & time to re-encode, same as if you skipped FFmpeg and used the included x264 encoder on its own. Things are less clearcut however, when it comes to hardware acceleration. Your mileage may vary depending on the software, the device GPU, the video you're working with, the version of Windows, the software & drivers you have installed etc. Bear in mind that there's little the GPU can do for you when encoding using x264, the AVC/H.264 encoder in FFmpeg.
Decoding & encoding video requires lots of calculations, particularly when using advanced video formats. As a sort of side effect of their design, graphics processors [GPUs] are better at performing some types of calculations than CPUs, so why not use the GPU in those cases where it's better/faster, like (re)encoding video? One problem is that it's hard to manage sending data back & forth between the CPU and GPU -- the GPU might be faster, but overall speed and efficiency can be lost if the CPU winds up waiting for the GPU to return the results. Another problem comes from all the different brand/model GPUs, all with varying capabilities. Some new AMD GPUs have NO video encoding capabilities, at all. 3rd, using the GPU to accelerate video encoding most often means lower quality results.
Some paid encoders [e.g. from MainConcept] only use the GPU for operations where it won't compromise quality, and then engineer their code so the CPU isn't left idle, but getting it to work optimally can be tricky, depending on brand/model of GPU, driver version, and even what video-related software's installed. OTOH, some free & paid encoding [converter] apps try to perform most or all of the processing using the GPU, and while they're generally the fastest alternative, you usually lose a bit more quality & have fewer features, e.g. A's Video Converter -- bluesky-soft[.]com/en/
VideoProc Converter itself takes up ~180MB, with 3,854 files, 304 folders in the program's folder -- there is no 64-bit version. A Digiarty folder is also added to Users\ [UserName]\ AppData\ Roaming\. Other than uninstall, the registry only gets an entry with the path to the app.