Unable to install Sitecore 9.0.2 while having Sitecore 10

Question

Trying to install Sitecore 9.0.2 on a machine that already has Sitecore 10. However, getting below error. Do I need to change the Sitecore module?

Install-SitecoreConfiguration : A registration exists for the Task 'AddWebFeatureSSL' (Invoke-AddWebFeatureSSLTask).
Use -Force to override.
output file is C:\Workspace\sc902_install\xconnect-createcert.220805.log

At C:\Program Files\WindowsPowerShell\Modules\SitecoreInstallFramework\1.2.1\Private\RegistrationHandler.ps1:82 char:9

Answer 1

I think this is an issue with your SitecoreInstallFramework version and for this you need to use the accurate version to install Sitecore 9.0.2.

Here are some commands to check it.

List all version

Find-Module -Name SitecoreInstallFramework -AllVersions

Install a specific version

Install-Module -Name SitecoreInstallFramework -Repository SitecoreGallery -RequiredVersion 1.2.1

Switching versions

Remove-Module -Name SitecoreInstallFramework
Import-Module -Name SitecoreInstallFramework -RequiredVersion 1.2.1

Use this article for more details.

https://www.koenheye.be/multiple-versions-of-the-sitecore-install-framework/

And this is something about the error you are facing.

Error while installing Sitecore 9 update 2 on the same computer that has a 9.1.0 installation

Answer 2

Issue was due to module SitecoreFundamentals installed. Uninstalled it and it solved the issue