I have a new evaluation licensed Aspose Total and I am having exactly the same problems with the license working for cells and doc but NOT for slides (version 16.10).
I have observed your comments and suggest you to please try using Aspose.Slides for Java 16.2.0 on your end. If there is still an issue then please share the license file with us by following these guidelines. Please notify us here in this thread as well once you have shared the license. I will investigate the issue further to help you out.
I have emailed a copy of my license.
I have found the fix - Aspose slides seems to need the full path of the licence file to be specified rather than specifying the licence by file name only if it is located in the same folder as the aspose .jar files (as per the other product modules like words, cells, imaging, etc). E.g
Thank you for the elaboration. Can you please make sure on your end by placing the license file along side your java class file and then executing that using console on your end. I hope this will work. If there is still an issue in this regard, I may add a ticket in our issue tracking system to further investigate the issue on our end.