Right-click VMware-python.msi and click Install.

Right-click VMware-OpenSSL.msi and click Install.

When the vCenter Single Sign-On installation is complete, the installer proceeds with the vSphere Web Client and vCenter Inventory Service installations.

The vCenter Single Sign-On installation begins.

msi may be in the process of installing another program.

Reinstall the SSO prerequisites for Python and OpenSSL.Reinstall the SSO prerequisites for Python 1618 ERRORINSTALLALREADYRUNNING 1618, // Another installation is in progress.

Right-click the CIS folder, click Rename, and change the name to CIS.old.

Select all files and directories within the TEMP directory and move them to the Backup folder.

Create a new folder named Backup under TEMP.

In the system where the SSO installation failed, open Windows Explorer and navigate to %TEMP% Note: If the system takes you to a 1, 2, or 3 folder, navigate back to the.

Try to clean up stale SSO files and install the SSO prerequisites before retrying the installation:

Msi error code 1618