The original purpose was to democratize access to diagnostic information for independent mechanics, but tracking down this specific patcher today is extremely difficult. Most original links from the early 2020s are long dead. The most common source for the tool was the "MHH AUTO" forum, where users would actively share and request files. However, even there, you will find more requests for the Blue Sky patcher than actual working links. A typical forum post reads: "Jemand hier im Forum der vorzugsweise den Xentry Patcher von Blue Sky bei sich auf dem PC rumfliegen hat und mir zuschicken könnte..." (Anyone here who happens to have the Xentry Patcher by Blue Sky lying around on their PC and could send it to me...)
You will not have access to official support if the software fails during a crucial diagnosis. Xentry Patcher By Blue Sky Free Download