I got this error when trying to install an update to the Wycombe Air Park scenery by Pilot Plus.
I deleted the folder “pilotplus-airport-egtb-wycombeairpark”, and was able to update it, with no errors. I’m guessing in some situations a file gets locked, and the sim can’t deal with this. It’s an easy workaround, and probably needs to be reported to Zendesk.
A similar scenario occured with the Carenado Seminole, but this didn’t result in a crash, just a failed update. The workaround was the same, close sim, delete folder, redownload scenery/aircraft.