autocad files

one user got autocad2011 and all other autocad users with autocad 2015 and autocad 2016 . autocad 2011 user cant upgrade to 2015 or 2016 because of a application . how 2011 autocad user will get problem with autocad 2015 and autocad 2016 files ?
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NVITEnd-user supportCommented:
If you want to maintain DWG compatibility between 2016, 2015, and 2011... start by setting on the 2016 and 2015 stations: Options > Open and Save. From the list, choose: AutoCAD 2010

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