I found this recent answer on the same subject (*nix OS).
So (having unzipped 8.6.2) I changed all those settings in elasticsearch.yml.
I ran elasticsearch.bat.
Error:
[2023-03-04T15:59:45,029][ERROR][o.e.b.Elasticsearch ] [M17A] fatal exception while booting Elasticsearch
java.lang.RuntimeException: org.elasticsearch.cli.UserException: will not overwrite keystore at [D:\apps\ElasticSearch\elasticsearch-7.10.2\config\elasticsearch.keystore], because this incurs changing the file owner
at org.elasticsearch.bootstrap.Elasticsearch.initPhase2(Elasticsearch.java:150) ~[elasticsearch-8.6.2.jar:?]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:66) ~[elasticsearch-8.6.2.jar:?]
Caused by: org.elasticsearch.cli.UserException: will not overwrite keystore at [D:\apps\ElasticSearch\elasticsearch-7.10.2\config\elasticsearch.keystore], because this incurs changing the file owner
at org.elasticsearch.common.settings.KeyStoreWrapper.save(KeyStoreWrapper.java:480) ~[elasticsearch-8.6.2.jar:?]
at org.elasticsearch.common.settings.KeyStoreWrapper.save(KeyStoreWrapper.java:412) ~[elasticsearch-8.6.2.jar:?]
at org.elasticsearch.common.settings.KeyStoreWrapper.upgrade(KeyStoreWrapper.java:291) ~[elasticsearch-8.6.2.jar:?]
at org.elasticsearch.common.settings.KeyStoreWrapper.bootstrap(KeyStoreWrapper.java:221) ~[elasticsearch-8.6.2.jar:?]
at org.elasticsearch.bootstrap.Elasticsearch.initPhase2(Elasticsearch.java:148) ~[elasticsearch-8.6.2.jar:?]
... 1 more
... right: I don't want it to "overwrite keystore at ... \elasticsearch-7.10.2 ...". Why is it using a "key store" from another ES instance? How can I persuade it to make a separate "key store"?