HTTPFileUpload plugin v1.2.0 does not want to be installed.
There is no such plugin’s version available. 1.1.0 is the latest.
What is there then?
The description of the plugin speaks about version 1.1.3.
1.1.0 - February 19, 2018
Updated to HttpFileUploadComponent v1.1.3, which resolves:
Issue # 5: Maximum allowable file size should be configurable.
Issue # 6: Fix for NPE when client uses XEP v0.3 or higher.
Issue # 7: Response to slot requests should use syntax of the request.
Issue # 8: Add maximum file size to service discovery responses.
You are looking at the component/library which is used as a base for a plugin and it has separate version number. I have actually tried to do a new release of a plugin with the latest component, but it wasn’t as straightforward as just replacing it with a new component. We will have to wait for Guus to look into that (or someone else with more knowledge) https://github.com/igniterealtime/openfire-httpFileUpload-plugin/pull/3