My path for the preferred library was C:\Users\yourname\AppData\Roaming\calibre. I was able to delete that file and restart calibre. Went thru all the start up then got the same error message about the data file being corrupt. Here's the details from the error
Traceback (most recent call last):
File "site-packages\calibre\gui2\wizard\__init__.py", line 551, in move_library
File "site-packages\calibre\library\database2.py", line 145, in __init__
File "site-packages\calibre\library\schema_upgrades.py", line 22, in __init__
File "site-packages\calibre\library\schema_upgrades.py", line 36, in upgrade_version_1
File "site-packages\calibre\library\sqlite.py", line 251, in run
DatabaseException: unable to open database file
RemoteTraceback (most recent call last):
File "site-packages\calibre\library\sqlite.py", line 215, in run
OperationalError: unable to open database file
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