I know for HP machines, the bios updater exe can be decompressed and you can just get the bios image and the signature file from that.
Idk what machine you have, but at least for an older aspire laptop my friend has, there is a bios download.
If you follow instructions to make bios recovery media, you can update your bios through that.
Edit: that Acer laptop you have doesn’t even show up on Acer’s support page. Supposedly it’s sold as an Acer aspire a something or other. If you search based on your snid, you should be able to get to a downloads page.
Also clevo seems to make this laptop, according to the Acer India webpage I found for it