Hi. Every time I launch Rhino, this V-ray notice pop-ups, sometimes with a V-ray log panel… What does it mean and how can I get rid of it? 
Hi,
This is an upgrade notice. It pops up to warn you that you will no longer be able to open the file with the V-Ray version it was last saved with. This is important if you upgrade your V-Ray version - there are certain considerations if you have co-workers that had not upgraded.
We have forward compatibility - e.g. you can open models created with older versions, but not backward compatibility - e.g. older versions may not be able to open models created with newer versions. The last time we broke the backward compatibility was with the release of V-Ray 5.00.01
You can’t get rid of it. If you open the file in non-interactive way it will not popup, but print on the command line.
The text you see in the Log window is similar but concerns different part of the integration.
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Thank you! I thought there would be a setting to disable the reminder~