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Operation with Windows XP or Vista - EZNEC v. 6.0 program types other than EZNEC Pro/4 were able to run on those operating systems provided that the machine had an Intel CPU. Neither EZNEC Pro/2+ nor EZNEC Pro/4+ will operate on any system earlier than Windows 7.
Legacy 2D plot grid
NEC-4 SEGCHK - Checking geometry with the NEC-4 SEGCHK function instead of or in addition to the EZNEC geometry checking function is no longer an option.
NEC-4.1 support - EZNEC Pro+ does not support NEC-4.1 and will not read or write files in that format. See LLNL for information about upgrading NEC-4.1 to NEC-4.2.
Segment junction intersections - Wires are no longer allowed to intersect at segment junctions, but only contact at wire ends. A new feature allows automatic conversion to wire end connections.
NEC file format - NEC format assumed for reading and used for writing NEC format files is now determined by the current calculating engine selection.
Directory locations - In response to the continued increase in file locations which Windows prohibits writing to, the main EZNEC Pro+ working directory has been moved to the C: drive root directory and all files are written to it and its subdirectories by default. Most of these locations can be moved but doing so is discouraged. A subdirectory of C:\Program Files [(x86)]\ is still used for the program files but EZNEC writes no files to it.
Calculating Engine Type Memory - Unlike previous versions of EZNEC, the calculating engine type selection isn't shared with other EZNEC versions on the same machine. The EZNEC Pro+ v. 7.0 calculating engine choice is saved at a different Registry location than previous versions.
Single precision calculating engines - Single precision internal NEC-2 and NEC-4.2 calculating engines are now recommended only for some very large models where insufficient RAM is available to allow double precision operation. So these engines are now available only by setting a Special Option.
NEC Radials - NEC radials, previously available in EZNEC Pro without setting a Special Option, now require one.
Transformers - The default winding impedances when creating a new transformer have been changed from 1 to 50 ohms to be closer to typically encountered impedances.
No Hardware key - Not really a change, since no hardware key has been required for EZNEC Pro beginning with v. 6.0.34. No hardware key is or ever will be required for EZNEC Pro/2+ or EZNEC Pro/4+.