RAM is hardware, and you can't download it.
Probably, whatever you read on the internet wasn't https://dfarq.homeip.net/download-more-ram-safe-scam-joke/
The best way to make your computer as fast as it was 5 year ago is to go back to factory conditions, and then go ahead again, installing only those programs you really need,
My computer this year is also 5 years old. It has an i5 processor chip and is using 4GB RAM asus k56cm. Use this year has a lag phenomenon. I want to use the computer more smoothly. How to help my computer faster. I see on the internet there is downloadram method for computers. Is that true? Or just a joke?