Cura says my .stl file is either corrupted or inaccessible

[danthemantube 0]

I have uninstalled and reinstalled Cura 3 times. Everytime i try to upload a .stl file i get a error message that reads the destination of my file, and finishes with that it can not be opened because the file is either corrupted or inaccessible. 

All the files have been downloaded from thingiverse. Not sure what i can do. 

[Mari 35]

attach one of those files so we can take a look at it...

[kmanstudios 1,120]

Did you try to download the file again? Files can be corrupted during that process.

And, I have downloaded files from Thingiverse that have been poorly made/modified and corrupted.