Software: easy rider for eurotherm 637 controller

Hello Peter.  We have a Knowledge Base article where you can download EasyRider here:

Parvex Motion Explorer and Easy Rider Software - Electromechanical Knowledge Base - Electromechanical Group - Parker Community

We also have documentation available on the 637 available on this Knowledge Base article:

630 Family Replacement Options (631, 635, 637) (Parker SSD / Eurotherm out of Europe) - Electromechanical Knowledge Base - Electromechanical Group - Parker Community

My recommendation is that you begin planning a modernization for this machine.  The entire 63X family has been discontinued and repair services are no longer available.