Hi, in your case you may not need/want to remove the references to missing previous plug-in versions. The elements inside your scene might be useful, e.g. Lights/Materials etc. In your case you should try to use the vRay Scene Converter to see if it can update the outdated elements in your scene file:
https://docs.chaosgroup.com/display/VMAX/V-Ray+Scene+Converter
If sucessfully converted, save the scene to a new file, close the original and try to open the new 'converted' scene and see if you still get missing .dlr errors. If you don't; the vRay Scene Converter has worked. If you still get errors, then it hasn't converted all the outdated elements... and then this is something you need to bring up with Chaosgroup. It is my guess that vRay version 1.0/2.0 elements in a scene might not be compatible with newer versions of vRay such as 3.6 or 3.7
https://forums.chaosgroup.com/
Regards,
Darawork
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