1. Rename the orignal "Interface.dll" to "Interface.dl1".
2. Copy "Interface.dll" to the install directory.
3. Login is disabled.

#VirusTotal
Interface.dll                                                                     www.virustotal.com/#/file/3e77968d15c186c24d34ddc3fb8779bf088c794bb57832e5070c236feff4738c
Simplify3D-4.0.1-windows-x64-installer.exe              www.virustotal.com/#/file/b52dbc0a52076b62f5a13e69e922a283a9dddfb9afbf224aae9e84e29aea4768