It is possible to resolve versions of all the important components in the e-Forms infrastrucure with a working e-Forms renderer by opening the developers tools (usually F12) in the browser and then running the following function in the console:
scriptVersion()
The output will be similar to this:
CanvasInput: 1.0.5.9
Helpers: 1.0.5.9
NDFormsClientI: 1.0.5.9
FormsHub versions:
Neurodot.Forms.Hub.dll: v1.0.7.61
Neurodot.Forms.Common.dll: v1.0.0.3
Neurodot.Forms.Controls.dll: v1.0.7.61
Neurodot.Forms.Render.dll: v1.0.7.61
FormServer & Runtime versions: Neurodot.Forms.FormServer: v1.1.6.28