Can you try to install RealityCapture directly from C:\Program Files\Epic Games\RealityCapture using the installation file?
Then apply the application reset: Reset RealityCapture
and try to compute your project again.
Also, using external disks is not ideal, as there could be some short connection errors, which could end with errors like this. Can you try to save your new projects on C drive if it will be happening again?
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