First, it is important to clarify that vMix Pro is not free software . The version you mentioned (vMix Pro 23.0.68 x64) is older software from around 2020. While you may find "cracked" or "pirated" versions online offering it for free, downloading these is illegal, violates the software's EULA, and poses significant security risks (malware, trojans, etc.).
After conducting a search, I found that vMix Pro 230068 is indeed available for download, but I couldn't verify if it's available for free. The official vMix website offers a free trial version, which might be what you're looking for. vmix pro 230068 x64 free