Backup and restore

The solution was in:
https://tracker.moodle.org/browse/MDL-69355



Editing the file "lib/filelib.php" which is in en   :\xampp\htdocs\moodle\lib


Simply by adding a two 0's to if ($filesize > 100000000) {
So it looks like this if ($filesize > 1000000000) {
Xampp is restarted and everything is resolved.
You can now download all types of files larger than 10 megs.

Greetings,
Francisco