Sometimes it may happen that some PDF files can not be opened and edited with the PDF24 Editor which is part of the PDF24 Creator. The causes are different. I've often seen that some programs create incorrect PDF files for which the PDF24 Editor throws an error while loading the file. Here I have a tip if the file can be opened in a PDF reader which is often the case.
Simply create a new PDF file by printing the PDF on the PDF24 PDF printer. This creates a new PDF file with the same contents that is compatible with the PDF24 Editor. In every case you have problems with some PDF files you can use this tip to create a new working PDF file.