Hello, We bought GroupDocs.Viewer (develop OEM version) for Java 2.10.0 on 201505, due to some reason we didn’t use it. Until recently, we tried to use it on our private cloud, but the performance is very poor. EX: I tried to open a xlsx file with 10KB and it took me more than 2 mins until I gave up. Then, I tried to preview a pptx file with 2MB which took me more than 4 mins to open. My question is any version I may download without further charge with my current license and may solve V2.1...... Please follow this link in order to get more updates...