Zip archive, 3.83 MB, for the Acer Aspire ES1-432, with the configuration suffix C8AR appended to the model. The name does not say which board or revision is covered, or whether the package is a schematic, boardview or firmware. Extract it and look for an ODM board code inside. A configuration suffix usually reflects a retail SKU rather than a different mainboard, but always verify by reading the number on the PCB itself. If a flash image is included, save the existing chip contents with a programmer before overwriting.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @laptopbios21. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.