DaVice
2
Try navigating to the Paks directory, set the files to asscending order by clicking on the Date modified column and then delete the 5 oldest .pak files. Once deleted you can verify files in Steam which will redownload them and hopefully fix your problem.
The Pak directory is located:
…\Steam\steamapps\common\Conan Exiles\ConanSandbox\Content\Paks