The 3.x being kept is normal because your upgrading between major versions. However why your add/remove entry for 3.6 was removed when you upgraded, idk, maybe a installer glitch because the 4.3.1 build 1978 uses a brand new installer which was introduced after 4.2.
Its not really an issue since everything got imported correctly.
The installers are often also unistallers and vice-versa and when ran it should offer you a option to remove, though tbh Im not familiar with 3.6 installer anymore.
enjoy.
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