Hi,
With the 20.9 version of Advanced Installer, we introduced a major redesign of the Prerequisite support. However, after the release, we discovered some issues that were not covered by our testing, leading to unexpected behavior for some use cases. We are actively working on addressing these issues, and the 20.9.1 version with improvements and fixes is on its way and will be released soon.
To minimize the impact on our users, we removed the entry for the 20.9 version from the .ini file to limit notifications about this release. Although the 20.9 version can still be downloaded from our website, the Updater will not prompt existing users to update to this version.
In your specific case, it seems that you made changes using the 20.9 version and saved them in your repository. However, when the DevOps plugin runs, it checks the .ini file from our server to determine the latest version, and as a result, it installs the 20.8 version, which causes the error you encountered.
But don't worry, we have a couple of workarounds to help you proceed smoothly.
In your
Variables tab, please create the following variable:

- advinst.png (52.06 KiB) Viewed 49365 times
The plugin will download the 20.9 and the build will be successful.
Another workaround is to revert your project to 20.8 version, before upgrading to 20.9. This workaround is available only if the project was created with a version lower than 20.9 version.
Once again, thank you for your patience and understanding. We are actively working to resolve these issues and provide you with a more stable and improved version in the 20.9.1 release.
If you have any further questions or need assistance, please feel free to reach out to us. We are here to help.
Best regards,
Dan