There’s a few considerations:
- preparing the sideload file is a bit of a time consuming task.
- there are very few (<10) people who have actually needed/requested/used this method to update
- because of this it is best (for us) to let a stable release stabilize a bit before preparing the sideload file. We have already prepared another update (0.0.17) to release soon.
I’ve also removed the file from the link you provided. As you pointed out, it’s old.