[Unity Hub] Install failed: Validation Failed. Some fixes for this issue.

All users:
For all of these methods, make sure to close all "Unity & Unity Hub" instances and check to make sure that you have quit out of the tray icon. You can double check through the "task manager" to make sure all instances are closed.

- First, try running "Unity Hub" as administrator. Right click on the desktop icon, then left click on "Run as Administrator".

- Apple option "Private Relay"' May block the install download, disable it and then try the download again.

- Make sure to allow unity through your firewall or antivirus, normally it'll ask the first time you install unity hub and unity "If you want to allow it access".

- Temporary disable "Firewall", then run the install as administrator.

- Temporary disable "Antivirus", then run the install as administrator.

- Temporarily disable "User account control" then run the install as administrator.

- If your using a VPN, that has caused the issue in the past, so you may have to disable or change your location. In one instance a VPN helped, when the user changed his location.

- Clear the "Cache" within Unity Hub, you can manually delete the cache folder. Here's how you can do it:
1. Open your file explorer.
2. Navigate to the cache directory for Unity Hub. The location may vary based on your operating system:
- Windows: Go to %LOCALAPPDATA%\UnityHub or %APPDATA%\UnityHub
- Mac: Go to ~/Library/Application Support/UnityHub
Once inside the Unity Hub directory, delete the "Cache" folder." If you can't find a "Cache" folder, it's possible that Unity Hub is using a different location for cache storage.
Note: Deleting the cache folder will remove all cached installation files, which will need to be redownloaded the next time you install Unity versions or modules. It shouldn't affect any existing Unity installations or projects.
After deleting the cache folder, relaunch Unity Hub as administrator and attempt the installation again.

- Search "Change User Account Control Settings" and select never notify

- Try to delete the unity hub temp folders. In your search bar type: &TEMP% and remove everything to do with unity hub or can simply delete everything, then delete from the recycle bin. Then restart your computer and run unity as administrator.

- If that doesn't work, You may have to downgrade to a previous version (Link below).

Mac users:
- Change the owner of the directory to user and the installation. Although you mite have to also create the "Hub" and "Editor" folders manually first. Similar to user/Applications/Unity/Hub/Editor then, make sure all three have their permission set for the intended user.
- Mite have to go to "Security and Privacy" and give Unity Hub "Full Disk Access".

[thRace]

The first thing worked running as admin. on Windows 11 for Unity 2022.3.30f1 Thanks!

[abdulmlaikalomayri]

Thank you man, you're the best, I have just uninstall unity hub, and delete cahces, and then restart the pc after that I turned off fireware and install unity. It's works, god bless you

[sandeshsg]

I get "Install failed: Validation Failed" as soon as the editor starts installing, i tried running it as admin, i turned off my windows firewall, i am not using VPN, I set the UAC to low, i have literally tried all the solutions on stack overflow, still no luck. I have uninstalled and reinstalled like 26 times, PLEASE SEND HELP

[arabgamer]

Guys plz i cant install unity editor from unity hub
So i download the editor from unity archive
I downloaded unity 2022.3.41f1
And 20223.42f1 and when i locate it from unity hub the massage come
This is not a valid unity application

What shou i do plz😢😢😢😢

[Hytension]

Honestly pretty ridiculous for an installation.

[orson]

Disable your anti virus and run as administrator easy fix

[inmiutes]

I use a Mac mine worked by giving unity access under privacy and security settings

[TheLion-iv]

I swear, if it wasn't for my study purpose i wouldn't even download this shit. Godot better