If this right you have to install the latest LR version or you have to convert your RAW files to the DNG format using the Adobe Digital Negative Converter or the tool that was delivered with your camera.
BTW. Please be moderate when you post your problem here. This is a public forum and we are all normal users as your are.
Use the Free Adobe DNG converter program to convert the RAW files to DNG files and then you can import them into your older version of LrC on your older computer that does not meet the specs for the newer version of LrC.