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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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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 ?

autocad files

Computer-aided design (CAD) is the use of computer systems to aid in the creation, modification, analysis, or optimization of a design. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. CAD software for mechanical design uses either vector-based graphics to depict the objects of traditional drafting, or may also produce raster graphics showing the overall appearance of designed objects. As in the manual drafting of technical and engineering drawings, the output of CAD must convey information, such as materials, processes, dimensions, and tolerances, according to application-specific conventions.

CAD/Architecture Software

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.