difference between online and offline version

There seems to a difference between the online and offline version.
When I download Jens" recent genious work, it doesnt work anymore.

There is a height attribute of the stage in the online version as in picture.
This doesnt exist in my offline version.
Is this my fault, because my offline version isnt up to date with the online version??

hieght of stage

It's probably not up to date. Run git pull while in the repository to update it.

If you click on the Snap! logo in the top left (in Snap!, not here in the forum!) there's an About choice that will tell you the version number.