If you are unfamiliar with BOSS then it would be a good idea to read up on what it does on the BOSS file page here on the Nexus. It will be patched in soon (you are safe to pick yes or no). NMM does ask you if you want to download the latest BOSS masterlist, but at the moment this will not have any effect on your load order. Priority with this release has been to just make sure the load order functionality is restored after Bethesda and Valve changed it to accommodate Steam Workshop.
That means that your load order is still completely managed by you. In regards to version 0.15.x of NMM it's important to note that while NMM is now using BOSS API to manage load orders NMM does not currently use BOSS's auto-sorting functionality. This is a hotfix patch to resolve the issues that 0.15.0 presented.Ī big thanks to kaburke and wrinklyninja who have worked on a Saturday to get this out for us. Nexus Mod Manager version 0.15.7 has just gone live on the release server and should be available when you start NMM (if you can start NMM) or from the download page for NMM.