Can't install 2.8

[Brian_Wilson]

When I attempt to install ArcGIS Pro 2.8 from either starting the MSI or from the command line, I get

"You must accept the EULA to install ArcGIS Pro"

...and yes, of course, I tried both checking and not checking the box "I accept the Master Agreement" and on the command line using "ACCEPTEULA=YES" and various others like "ACCEPTEULA=1".

I am jealous of people reporting problems here with 2.8 since they seem to have been able to install it.

This is the command line I am using

msiexec.exe /i ArcGISPro.msi ACCEPTEULA=YES /qb

[RichardDaniels]

This same issue happens with ArcGIS Pro 2.8 to 2.9 upgrade. Core issue can be two fold, left behind registry setting from ArcGIS Pro uninstaller OR there is a clone of the default Conda (Python) environment. ESRI recommended that Pro users not modify the default environment, so a user needs to clone  if they want to install any additional Conda packages -e.g., deep learning modules.

In regards to registry settings, we found that under Installer related settings under the apps GUID, {26C745E6-B3C1-467B-9523-727D1803EE07} were left behind. When these 3 settings were deleted the installer for the next higher version worked.

Cond environment removal information at Delete an environment—ArcGIS Pro | Documentation

[Lkoman]

Hello

Can you please provide the full location of this registry key that you delete?
, {26C745E6-B3C1-467B-9523-727D1803EE07}

Thanks
Laurene Koman
ArcGIS Install Team.

[RichardDaniels]

Look under:

HKEY_CLASSES_ROOT\Installer\Products\6E547C621C3BB764593227D78130EE70

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\6E547C621C3BB764593227D78130EE70

Note after uninstall of 2.8 at least one of these registry settings remained, it might be easier to search for ProductName='ArcGIS Pro' to find it and then delete.

HKEY_LOCAL_MACHINE\SOFTWARE\ESRI\ArcGISPro is also there, it references Python.