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‹After installing docker and trying to start it, it gives me the message:
“Docker.app is corrupted and cannot be opened.”
“This file was downloaded with an unknown date.”
And it is removed from the applications folder.
I already tried everything I found on the internet
If you can share what you tried, we don’t have to recommend you the whole internet again 
But I searched for the “corrupt” keyword in the “Docker Desktop for Mac” category (where you should have created this topic, but I will move it to there) and found my old answer from last year
where I linked this topic
Since you shared the OS version which is the latest that can’t be the problem, but it is possible that you downloaded the dmg file for the wrong architecture (Intel vs arm) or something happened during downloading. What is the architecture of the CPU in your Mac?
Update:
On second thought, “unknown date” seems to be a different problem.
Update 2 (Checking the date of Docker.app)
Mount Docker.dmg
open the mounted Disk under “Locations” called “Docker”
Open the context menu of Docker.app and select “Show Package Contents”
Open the “Contents” folder
open the “MacOS” folder
open the context menu of “Docker Desktop.app” and select “Get Info”
Check the dates (Modified and Created)
Then you can also check the date on your machine
date
My result
Sun Mar 26 22:04:54 CEST 2023
Sometimes an incorrect local time can cause problems.
I also moved the topic the the right category and renamed it.
How did you fix it? Having a similar issue at the moment
verify or repair failed. : (-69845)" error, which was quite frustrating. After searching for solutions, I came across a really useful guide at (moderated link). The steps outlined in the article helped me identify the root of the issue and provided various methods to address it effectively. I followed the instructions, which included using specific recovery software and running a series of checks on the drive.
Fixed, I guess? Please update us if there’s anything further to address or if additional issues arise. While looking into this, I came across a guide that explains how to fix a corrupted hard drive on Mac: (moderated link). It provides detailed steps and might be helpful for anyone dealing with similar problems. Feel free to share if it works for you or if there are other solutions worth considering.
If you download the right installer for the right architecture and nothing happens during downloafing the installer it should work. I’m not sure how two links about fixing hard drives related to this issue. If a hard drive is corrupted, you would probably have much more problems then a single file. IF you had more problems, that is not a Docker issue and the links are not really relevant here.
Where did you see it? And again, how is it related to this issue? We have not discussed that error code at all.