It is an official?
You must be kidding, this must be a scam, not official, easy to cheat on people, never trust this people, it is newbie.
Not a joke. You can download the wallet NOW. https://www.bitcoinunlimited.info/download
Virus total says 4/61
https://virustotal.com/en/file/26ef474ca4dfcdfb547b865db49fe9de381d97be70bb0e7cd90e3915841a14e2/analysis/
https://www.virustotal.com/en/file/f260d52cf2fe91c4be99ed6fcf8aa0de669ff326c5da920b7ed3a3e2ec981e0a/analysis/
You trust this? Hilarious makes my day, BTU doesn't need this lame OP to publish, the real BTU will be released after the hard fork, not this scammer post the OP.