I need to do a complete ground up deletion/re-installation on my (Windows) laptop. Currently I have SPP 5.5.3 and when I download from the Sigma website, it's going to be v6 something. Given that I have the DP Merrills and have no intention of getting the Quattros, are there any downsides? I don't think any version after 5.5.3 has anything that benefits DP Merrills. Also I have an older desktop computer - presumably I'd have to update that as a file which has been opened in v6 can't be opened with v5, so i understand.