You may still have a legacy Visualforce page from Apsona called “apsonaEchoCsv” in your org. The latest version of Apsona for Salesforce removed the "apsonaEchoCsv" Visualforce page, which was previously unused, but referenced a deprecated SOAP API version. This deprecated SOAP API version was removed by Salesforce with their Summer '22 release.
Apsona no longer uses this Visualforce page, so no functionality will be impacted even if you do not remove this page. However, you will continue to receive emails from Salesforce regarding its deletion. Due to Salesforce limitations, Apsona cannot remove this page for you - customers must remove this page on their own from their Salesforce organizations.
Therefore, we ask that you delete this page from your org. To do so,
Go to Salesforce > Setup > search for "Visualforce Pages". Click on the "Visualforce Pages" tab in the sidebar.

Within the "Visualforce Pages" page, search for "apsonaEchoCsv". If you do not see this page, you do not need to take any further action. If you do see this page, click "Del" on the left of that row:

Click OK on the resulting "Are you sure?" popup.

For more information about our install packages and API version, see this article.
Please let us know if you have any questions or concerns.