I understand you have questions on the Intel-SA-00086 or the Intel® Management Engine Critical Firmware Update. Let me help you on this matter.
To answer your questions:
1. The update was provided to Hewlett-Packard and you need to check with them to get the firmware update for your specific computer model, please copy and paste the link below in a separate window for more information
2. This is from Hewlett-Packard
3. Contact your system or motherboard manufacturer to obtain the this information.
For further information, please see this link https://www.intel.com/content/www/us/en/support/articles/000025619/software.html# FAQ Intel® Management Engine Critical Firmware Update (Intel-SA-00086)
Hope it helps.