A Steam Community Group Announcement has word that the new patch is once again available for Mortal Kombat X, following news that it was revoked because it was deleting saved games (thanks VG247). They also address the loss of saved games players may have suffered while the misbehaving patch was in the wild, saying impacted players should be hearing from them by tomorrow:

We understand that some PC players lost their save data before we were able to correct an issue with the most recent patch. An updated patch was recently released to add Jason and all of the other patch improvements back into the game and no other players should experience save loss when installing the patch. We are truly sorry if the recent patch did cause you to lose your game save. Affected players should be hearing from us soon with details on how we are addressing the situation.

If you lost your save due to the patch and have not heard from us by Friday May 8th at 12pm EST, please submit a Customer Service help request by visiting support.wbgames.com and selecting “Ask for Help” from the menu at the top. Select “Gameplay Help Request” as your Question Type, “Save Game issue” as your Specific Question, and include your Steam Account Name in your help request description. We will make sure that you are helped out if you were impacted by this issue.