The Plug in error

I tried to use Rhino 8, but the error occurred loading plug-in. It said " The process cannot access the file 'C:\Users\USER\AppData\Roaming\McNeel\Rhinoveros\8.0\Plug-in(9bc28e9e-7a6c-4b8f-a0c6-3d05e02d1b97)\data\RhinoCycles20240308

because it is being used by another process.

Please contact the plug-in vendor to get the latest version"

How can I solve this problem?. All I did was just install the Rhino 8 and click the polyline button. But the error kept occuring.

To sovle it,I rebooted, reinstalled, check the plug in and properties all day, but it is still not working and I donโ€™t know why.

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This happens when you start multiple Rhino instances at the same time with Rhino 8.4. This is already fixed with Rhino 8.5 service release candidate. But if you canโ€™t update yet then make sure to have at least a second between different Rhino launches.

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This is the evaluation version. Can I update Rhino from 8.4 to 8.5?

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Yes. Go to Tools > Options > Updates and Statistics. Set update frequency to Service Release Candidate, then click on Check Nowโ€ฆ to download the installer for the 8.5 service release candidate.