IDE/BoardPackage Install Got Whacked

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i attempted install beta esp8266 board package (v2.4.0-rc2) , , attempt seems have whacked ide installation.  while esp8266 boards show in boards menu, , library installed in correct packages subdirectory within appdata\local\arduino15, attempt compile using 8266 board gives error message neither platform nor board known.  i'm guessing package_index.json has been corrupted, or @ least not correctly updated, @ loss know how things working again.  i've uninstalled offending package, , re-installed previous 1 working (v2.2.0), no avail.  it's still broken.

is there way fix other doing fresh re-install of whole ide/board packages , else?

i wish easier understand how stuff tied together.  seems spend more time lately fighting vagaries of ide, goofy build process, , serious bugs, writing code....

regards,
ray l.

please describe exact process followed install v2.4.0-rc2. if found instructions somewhere can post link them.


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