You're looking for information on RINEX Converter 5.0.8 and where to download it. Here's what I found:
RINEX (Receiver Independent Exchange Format) Converter is a software tool used to convert GPS and GNSS data from various receiver formats to the RINEX format, which is a widely accepted standard for exchanging GNSS data. rinex converter 5.0 8 download
RINEX Converter 5.0.8 is a specific version of the software. According to various sources, this version is compatible with Windows operating systems. You're looking for information on RINEX Converter 5