You can use a standard Windows 8 or 8.1 ISO to load an Acer device (some models only support 32 bit versions) but afterwards you have to load the special Acer drivers (can download from the support page) to make things like a touch screen or thermal management or WiFi work.
Luggable, 1983 My first PC
Please: Make a recovery drive and store a full system image offline before upgrading.
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