Elasticsearch 7.6.2 won't run on windows 10

Elastic Stack Elasticsearch
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Please help! On Windows 10 I have 7.5.2 running OK, but a new installation of 7.6.2 fails with the abbreviated stack trace below

windows 10 elasticsearch 7.5.2 RUNNING on windows 10
on the same machine
windows 10 elasticsearch 7.6.2 FAILING TO RUN on windows 10

elasticsearch.log:

[2020-05-04T07:55:59,640][INFO ][o.e.c.c.Coordinator      ] [ELASTIC-40X] master node [{ELASTIC-40X}{SR9QNN9gSaOxLuAhI2pfDw}{FcdcorEsStyNAGl5Gj2Ggw}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=17054642176, ml.max_open_jobs=20, xpack.installed=true}] failed, restarting discovery
org.elasticsearch.transport.NodeDisconnectedException: [ELASTIC-40X][127.0.0.1:9300][disconnected] disconnected
[2020-05-04T07:55:59,640][INFO ][o.e.c.s.ClusterApplierService] [ELASTIC-40X] master node changed {previous [{ELASTIC-40X}{SR9QNN9gSaOxLuAhI2pfDw}{FcdcorEsStyNAGl5Gj2Ggw}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=17054642176, ml.max_open_jobs=20, xpack.installed=true}], current []}, term: 7, version: 314, reason: becoming candidate: onLeaderFailure
[2020-05-04T07:56:00,672][WARN ][o.e.c.NodeConnectionsService] [ELASTIC-40X] failed to connect to {ELASTIC-40X}{SR9QNN9gSaOxLuAhI2pfDw}{FcdcorEsStyNAGl5Gj2Ggw}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=17054642176, ml.max_open_jobs=20, xpack.installed=true} (tried [1] times)
org.elasticsearch.transport.ConnectTransportException: [ELASTIC-40X][127.0.0.1:9300] connect_exception

Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: 127.0.0.1/127.0.0.1:9300
Caused by: java.net.ConnectException: Connection refused: no further information
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