You can download as many copies of the VAT Filer as you require. You will just need to check that the machine you are downloading to meets the minimum system requirements. If you are running on a Windows machine then the VAT Filer will only run on Windows 7 or above with Excel 2010 or later installed. If you are running a MAC machine it would need to be Mojave and Excel for MAC version 2016 16.26 and above.