Thank you for your response, however I was mislead by the CCM website which offered a FREE download of MS Office 2010. I currently use 2007 which will no longer be supported beyond 2017 so I need to upgrade, but my laptop will not take anything later than 2010. I will go ahead and purchase a copy
My laptop is nearly 10 yrs old and its OS is Vista Basic - hence the incompatibility with Office after 2010, whereas my PC's OS is Windows 10. Because I am constantly transferring complicated Excel spreadsheets between my PC and laptop and thence to more modern PCs in an organisation for which I act as Treasurer, I have to ensure compatibility between the spreadsheet software in each device.
Further research is leading me in the direction of purchasing a new Laptop so that I can install Office 2016 on both to ensure that there are no clashes when moving the data around