5.3 and 5.2 binaries aren't actually made for those engine versions.

[AstricX9]

When i inspected the .uplugin, it said the engine version was for 5.1???

[mordentral]

What they are actually built for is seperate from the uplugins version number.

The uplugin definition is something I have to go in and manually change and doesn't effect compilation. But also the 5.1 to 5.3 versions of the plugin are the same, there are no code changes until 5.4 so I left the 5.1-5.3 listed as 5.1 compatible.