It is my own machine and I wiped the directories between installs and re-unzipped from scratch.
I tried wangxiaohu’s solution for performance problem (disabling cache mechanism) and now my installs to a subdirectory are working. Does this make sense to anyone why the cache would break the install?
wangxiaohu’s solution to performance problem:
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Disabling the cache system solved the problem. In wp-config.php:
define(‘DISABLE_CACHE’, true);
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