This is a patch version for 1.8.5. Which fixes an error in the checkpoint (that could cause the synchronization from scratch for the blockchain to fail). This version also updated the checkpoints to the latest.
If you don't have a sync issue with 1.8.5 (or if you use the quicksync file), you can continuing using it. Otherwise this version will allow you to syncrhonize smoothly from the beginning.
Windows Wallet Client V1.8.5.1-DV (DeepOnion-qt.exe) is guaranteed by DeepVault, with verification address Dg9D3ZvXoLk6Ysw5SG8VVMiMDqXmWvEbjt.
You can verify the authenticity of the downloaded executable with DeepVault.
You can use quicksync file to sync if needed:
https://mega.nz/#!zzZlTIYQ!i_F8gLo_vTXl5egfoGyZMpXAlD_eO3ZfT9BFYaMLlbU
The virus report of the Windows Wallet V1.8.5.1-DV can be found here:
https://www.virustotal.com/gui/file/6704aba737f3c183bbc22fc43cbdf7ed6621b5502a27d8d37706275c454235cc/detection