The "official" version of EL3D is here:
A fancier but slightly buggy version is here:
Since EL3D is free please just go ahead and register with:
User Name: EL3D Generic
Registration key: eagle3d000-7D0F-GP05-SKCL-1S61-8F05
Again - please join the Yahoo Groups page in order to see how to get setup. Since EL3D is over 10 years old, there are a few hoops you might need to do to get up and running under Windows 10.