You need to update/install java JRE 1.7.
The problem is that the jar file is compiled using JRE 1.7 and you most likely have JRE version lower then 1.7
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when starting mynetpcb.jar i get the following error:
Exception in thread "main" java.lang.UnsupportClassVersionError "com/mynetpcb/myNetPCB"
You need to update/install java JRE 1.7.
The problem is that the jar file is compiled using JRE 1.7 and you most likely have JRE version lower then 1.7
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Run from comman line
java -version
to check which is you current version