Thanks for getting in touch with us.
Unfortunately we had to pull the new launcher from the store temporarily due to massive demands on internal servers. If you're still unable to download the new Horizons Beta Launcher, please try using this link:
https://t.co/vnoBcH9DfV.
If you receive a 'Server refused to provide installer: Not Available' please wait for a few minutes and try again.
We understand everyone's eagerness to take part in the beta as soon as possible however we would beg for patience while we try to keep the servers afloat for as many as possible.