BlocklyProp is migrating from the original community system that requires a login for each user, to BlocklyProp Solo where no login is required. The original BlocklyProp stores users' projects on a remote server, but BlocklyProp Solo stores users' projects on their own local file systems.
The Bulk Project Download feature lets you download a copy of all of your remotely stored projects in your account to your local file system. These files will be in the .svge format, and can be opened with BlocklyProp Solo.
You will see the message on the button change as the system creates an archive file, named BlocklyPropProjects.zip, that contains your individual projects.
The project archive folder contains a number of individual project files, each with an .svge file extension. The archiving utility named each file using the first 30 characters of a project's name and also the project's number.
The archive folder also contains a ExcludedProject.txt file with a list of any projects that could not be exported. These excluded files are either empty or contain very old, unsupported blocks.
To follow up on excluded projects:
http://blockly.parallax.com/blockly/my/projects.jsp#0
The .svge files in your project archive can only be used with BlocklyProp Solo. To use a file:
BlocklyProp Solo [2]
SVGE is for SOLO. Note that archive .svge files only work in BlocklyProp Solo. They differ from the .svg files in that they do not contain the visual block graphics.
Links
[1] http://blockly.parallax.com/blockly/
[2] https://solo.parallax.com/