Cannot get Navdata to work

I cannot get Navdata to work. I have installed and uninstalled it numerous times, but it keeps giving me the error message: EPERM operation not permitted, mkdir 'C. I have read the previous threads on the subject, but I cannot get it to work. I have tried changing the Appdata folder from read-only, but it keepd reverting back to read-only. Any help would be greatly appreciated.

Have you tried logging out and back in?

Thanks for the reply. I got it sorted out by deleting the TEMP file in Appdata. The first time I installed Navdata, there was no TEMP file to delete. After numerous installs and uninstalls a Tamp file showed up, and I deleted it.

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