I am on Calibre 3.48 and Mac Mojave. I downloaded Calibre 4.0 but when I tried to open DMG the Mac crashed and restarted. I opened 3.48 in debug mode and got the following. Can you help please.
Spoiler:
libpng warning: iCCP: known incorrect sRGB profile
calibre Debug log
calibre 3.48 embedded-python: True is64bit: True
Darwin-18.7.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '18.7.0', 'Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64')
Python 2.7.15
OSX: ('10.14.6', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 18, 0) && DeDRM (6, 6, 2) && Package KFX (from KFX Input) (1, 18, 0) && KFX metadata reader (from KFX Input) (1, 18, 0) && KFX Input (1, 18, 0) && KePub Output (3, 1, 3) && KoboTouchExtended (3, 1, 5) && Quality Check (1, 9, 11) && Resize Cover (1, 0, 2) && Kindle Collections (1, 7, 24) && Kobo Utilities (2, 8, 0)
calibre 3.48 embedded-python: True is64bit: True
Darwin-18.7.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '18.7.0', 'Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64')
Python 2.7.15
OSX: ('10.14.6', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 18, 0) && DeDRM (6, 6, 2) && Package KFX (from KFX Input) (1, 18, 0) && KFX metadata reader (from KFX Input) (1, 18, 0) && KFX Input (1, 18, 0) && KePub Output (3, 1, 3) && KoboTouchExtended (3, 1, 5) && Quality Check (1, 9, 11) && Resize Cover (1, 0, 2) && Kindle Collections (1, 7, 24) && Kobo Utilities (2, 8, 0)
devicePixelRatio: 2.0
logicalDpi: 72.0 x 72.0
physicalDpi: 108.50000163 x 107.500001614
Using calibre Qt style: True
[0.00] Starting up...
[0.02] Showing splash screen...
[0.17] splash screen shown
[0.17] Initializing db...
[0.60] db initialized
[0.60] Constructing main UI...
DEBUG: 0.0 KoboUtilites::action.py - loading translations
DEBUG: 0.0 KoboUtilites::dialogs.py - loading translations
DEBUG: 0.0 KoboUtilites::action.py - loading translations
DEBUG: 1.2 No Kobo Touch, Glo or Mini appears to be connected
DEBUG: 1.2 rebuild_menus - self.supports_ratings=None, self.supports_tiles=None
DEBUG: 1.2 KoboUtilities:set_toolbar_button_tooltip - start: text='None'
DEBUG: 1.2 KoboUtilities:set_toolbar_button_tooltip - setting to text='Utilities to use with Kobo ereaders
Driver: KoboTouchExtended'
[2.17] main UI initialized...
[2.17] Hiding splash screen
[2.23] splash screen hidden
[2.24] Started up in 2.24 seconds with 9343 books