I am unable to install anything from the XDA Labs app. I get a "Something went wrong! Download failed." XDA has permissions to access Storage and I have cleared ccache several times Ive even uninstalled and re-downloaded XDA Labs and reinstalled. My Phone, in case it relevant is a Huawei P30. I also had this error on my old Huawei Mate 9.
Did you read the few previous posts? Everything is explained already