The VSP Engine Tools post installer aborts with an error, but the VSP Engine Tools are successfully installed and are running on my ArcGIS Server Site. What might be the problem and how can I solve it?

If the tools are successfully published as a service on your server site, the service is running, and the tasks are available and executable, then the issue might be related to a connection problem to the published task's REST URL through the installer process.

The installation process checks if the service is running by calling the Product Info Task of the VSP Engine Tools. Make sure that a trusted TLS/SSL certificate is available for your server. If the problem is related to the certificate, either set a valid certificate and re-run the post installer or manually update the related geoprocessing tools Portal item to make the VSP Engine Tools available for other VertiGIS Studio products by performing the following steps:

1. add the Type Keyword 'VertiGIS Printing Engine Tools' to the existing typeKeywords parameter of the related geoprocessing tools portal item. This can be done by using VertiGIS Studio Item Manager or ArcGIS Online Assistant: https://assistant.esri-ps.com/signin
2. add the tag 'Designer Pro' to the tags of the related geoprocessing tools portal item to enable the ArcGIS Pro Layout Mode in VSP Designer.

Please see https://support.vertigis.com/hc/en-us/articles/18559433083410-Unable-to-Toggle-ArcGIS-Pro-Layout-Mode-in-Print-Designer-After-Installing-VertiGIS-Studio-Print-Engine for a detailed walkthrough of setting the Type Keyword and Tag.