A:AnswerThe laptops ship with Windows installed from factory. If you want to install a different operating system, you will need to do that after purchase.
A:AnswerThe storage on the Swift models are not generally upgradeable but if you feel comfortable with the disassembly, you will need to remove the battery to access those slots. Please note that any damage to the laptop by upgrading is not covered under the manufacturer's warranty. You can also post your question on the Acer Community forum where there are many users that offer advice, and also YouTube has videos that can be helpful as well.
A:AnswerI would say there is about 1-2mm of clearance between the NVME drive and the baseplate. I wouldn't go for anything more than a 1mm copper heatspreader (There are many on Amazon) as the thermal pad also has notable thickness.