Cannot load the license into eSpace U1980.
1. Look-up the file and folder viewing options. In Windows 7 the path is: Organize/Folder and search options/View/Hide extension from known file types . In Windows XP is: Tools/Folder option/View .
2. Uncheck this default setting and the filename suddenly changes to license.dat.dat. Change the name to license.dat and try loading it again into LMT or CDaemon TFTP server.
3. Result: Successful
As the prompts say, the issue must be related to the name of the file. Although I have changed the filename to license.dat as it says in the eSpace U1980 documents.
Leave the Hide extension from known file types unchecked because this can cause further problems in the future.