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This issue occurs when OneDrive is running and includes XLN Audio folders in its sync. To proceed with the installation using the XLN Online Installer, all folders related to XLN Audio products must be excluded from OneDrive. You can find Microsoft's instructions on how to do this here:
In case OneDrive won't stop syncing it then please see this forum post:
https://answers.microsoft.com/en-us/msoffice/forum/all/cant-stop-syncing-folder/cc99375d- 4041-4f51-940d-6c170d97afec
Instead of right clicking on the Desktop folder and changing the Location, try the instructions on the XLN Audio folders.
If you're still receiving this error message please contact XLN Audio support.