QuickBooks Error 1335 can show itself during the installation or update process, and it generally relates to a missing or corrupt file required for installation. It can be caused either by one corrupt or damaged file, Incomplete downloads, Permission issues, or issues with the system disk. To fix QuickBooks Error 1335, you first want to check if you meet all the system requirements and that you have administrative rights, for example. If there was no incomplete download, then you should try downloading the QuickBooks installation file from the official site again to avoid thinking you have a corrupt or incomplete file, etc. Run a disk check to verify that there is nothing wrong with your own hard drive. Temporarily suspend your antivirus as well as any temp files, and try reinstalling QuickBooks again from this point with a brand new install file.