0.8.5.2 not loading

[sandalholme]

I am probably not doing something obvious. I have been using 0.8.4, but today hit a problem. Specifically, I have Andsnes playing all 5 Beethoven concerti and also 3 Haydn concerti. Different album artwork. Beethoven's 3rd and 4th missing and Haydn's 3rd and 4 appear instead.each with the appropriate artwork and under composer Beethoven. The Haydn concerti also appear under composer Haydn with No11. Have checked the data in Metadatics, resaved, rescanned. Still no Beethoven 3 and 4.

So thought it time to move to 0.8.5.2. I have a MacMini running 10.12.6. downloaded Java jre-8u181-macosx-x63.dmg and then MinimServer 0.8.5.20macos. Moved MinimServer 0.8.4 and alias to Trash. Java confirmed installation.

I now have the Java Java 8 update 181 and MinimServer 0.8.5.2-macos 'disks' on the desktop. Neither appear in Applications. When I click on the 0.8.5.2 icon nothing happens at all.

Grateful for what may be a very simple elementary way forward.