[iggy grey]

all these files are in .7z format and Calibre only reads .zip. Convert the 7z to zip or unpacking the 7z then zipping the files doesn't work. Some of the zips inside the fiels work but nothing else.

I'm trying to go from google ebooks and Adobe reader to kindle fire.

This is the error from Calibre:

calibre, version 0.8.30
ERROR: Unhandled exception: <b>InvalidPlugin</b>:The plugin in u'F:/Documents/My Dropbox/Dwnloads/tools_v4.7 (1).zip' is invalid. It does not contain a top-level __init__.py file

Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\plugins.py", line 290, in add_plugin
File "site-packages\calibre\customize\ui.py", line 339, in add_plugin
File "site-packages\calibre\customize\ui.py", line 54, in load_plugin
File "site-packages\calibre\customize\zipplugin.py", line 160, in load
File "site-packages\calibre\customize\zipplugin.py", line 255, in _locate_code
InvalidPlugin: The plugin in u'F:/Documents/My Dropbox/Dwnloads/tools_v4.7 (1).zip' is invalid. It does not contain a top-level __init__.py file