Download the latest Bitcoin Cash compatible release of Bitcoin Unlimited (1.6.0.0, April 24th, 2019) from:

https://www.bitcoinunlimited.info/download

This is a major release of Bitcoin Unlimited which it is compatible with the upcoming May 2019 BCH protocol upgrade; this release is also compatible with all the already activated Bitcoin Cash network upgrades, namely:

• https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/uahf-technical-spec.md (Aug 1st '17 Protocol Upgrade)
• https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/nov-13-hardfork-spec.md (Nov 13th '17 Protocol Upgrade)
• https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/may-2018-hardfork.md (May 15th '18 Protocol Upgrade)
• https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/2018-nov-upgrade.md (Nov 15th '18 Protocol Upgrade)

List of notable changes and fixes contained in BUcash 1.6.0.0:

• Segwit P2SH recovery
• Schnorr signatures
• Compact Block implementations
• Basic integration with the electrum server electrs (experimental, off by default), see this [doc](bu-electrum-integration.md) for more info
• Graphene: do not send txns oders by leveraging CTOR
• Graphene: Fast Filter instead of Bloom Filter (optional)
• Graphene: seeding of IBLT hash function
• Graphene: use cheap hashes to avoid short id tx collision
• Graphene: reduce decode failure to 0.5% via IBLT padding
• Graphene: O(1) heuristic to determine IBLT / BF size for block over 600 txns
• RPC enhancements and new commands (getrawblocktransactions, getrawtransactionssince and gettxoutproofs)
• QA reliability improvemennts
• Easier gitian build process (docker based)
• Code restructure around the 3 block propagation techs we currently support (Graphene, CB, Xthin)
• Move to C 14 and bump lib boost minimum ver to match
• Update Windows build scripts
• Simplify and update Xpedited code
• Refactor Script interpreter as a "virtual machine" encapsulated by a class. This allows the script interpreter to be used outside of bitcoind (for example, its ability to "step" allows use in a script debugger).
• Implement Xversion changeable key
• Documentation improvements

Release notes: https://github.com/BitcoinUnlimited/BitcoinUnlimited/blob/dev/doc/release-notes/release-notes-bucash1.6.0.md

PS Ubuntu PPA repository is currently being updated to serve for BUcash 1.6.0.0.