Spyder cannot be opened because the developer cannot be verified

The Mac app fails to start. I am not even sure it actually loads spyder code before blocking, so this could be PY2APP related. I will investigate further later.
This is where I see the process stalling:

``` 0 libobjc.A.dylib 0x00007fff201d65dd class_copyProtocolList + 46 1 com.apple.CoreFoundation 0x00007fff204204e0 __methodDescriptionForSelector + 74 2 com.apple.CoreFoundation 0x00007fff2043a5f4 -[NSObject(NSObject) methodSignatureForSelector:] + 30 3 libqcocoa.dylib 0x0000000124ef7b79 0x124ee3000 + 84857 4 libqcocoa.dylib 0x0000000124ef774d 0x124ee3000 + 83789 5 QtGui 0x000000011ae59f27 QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) + 1207 6 QtWidgets 0x000000011a7107ee 0x11a6f8000 + 100334 7 QtWidgets 0x000000011a714aa2 0x11a6f8000 + 117410 8 QtWidgets 0x000000011a7655c4 0x11a6f8000 + 447940 9 QtWidgets 0x000000011a762944 0x11a6f8000 + 436548 10 QtWidgets 0x000000011a70867d QApplicationPrivate::notify_helper(QObject*, QEvent*) + 269 11 QtWidgets 0x000000011a709a82 QApplication::notify(QObject*, QEvent*) + 594 12 QtWidgets.so 0x000000011a3933ca sipQApplication::notify(QObject*, QEvent*) + 234 13 QtCore 0x0000000119e49324 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212 14 QtGui 0x000000011acd1115 QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) + 309 15 QtGui 0x000000011acaf0e3 bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 115 16 QtGui 0x000000011acb60c2 void QWindowSystemInterface::handleExposeEvent(QWindow*, QRegion const&) + 178 ```

0   libsystem_malloc.dylib        	0x00007fff201587cb tiny_malloc_should_clear + 62
1   libsystem_malloc.dylib        	0x00007fff20157793 szone_malloc_should_clear + 66
2   libsystem_malloc.dylib        	0x00007fff20170dfe _malloc_zone_malloc + 118
3   com.apple.CoreGraphics        	0x00007fff24f16625 CGGStackCreateWithGState + 20
4   com.apple.CoreGraphics        	0x00007fff24f16162 CGContextCreateWithDelegateAndInfo + 162
5   com.apple.AppKit              	0x00007fff22f0190e -[NSView lockFocusIfCanDraw] + 192
6   libqcocoa.dylib               	0x0000000124fa8063 0x124f94000 + 82019
7   QtGui                         	0x000000011af1cf27 QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) + 1207
8   QtWidgets                     	0x000000011a7d37ee 0x11a7bb000 + 100334
9   QtWidgets                     	0x000000011a7d7aa2 0x11a7bb000 + 117410
10  QtWidgets                     	0x000000011a8285c4 0x11a7bb000 + 447940
11  QtWidgets                     	0x000000011a825944 0x11a7bb000 + 436548
12  QtWidgets                     	0x000000011a7cb67d QApplicationPrivate::notify_helper(QObject*, QEvent*) + 269
13  QtWidgets                     	0x000000011a7cca82 QApplication::notify(QObject*, QEvent*) + 594
14  QtWidgets.so                  	0x000000011a4563ca sipQApplication::notify(QObject*, QEvent*) + 234
15  QtCore                        	0x0000000119f0c324 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212
16  QtGui                         	0x000000011ad94115 QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) + 309
17  QtGui                         	0x000000011ad720e3 bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 115
18  QtGui                         	0x000000011ad790c2 void QWindowSystemInterface::handleExposeEvent(QWindow*, QRegion const&) + 178

0   libobjc.A.dylib               	0x00007fff201eb8db objc_object::sidetable_release(bool, bool) + 197
1   libobjc.A.dylib               	0x00007fff201ec39d AutoreleasePoolPage::releaseUntil(objc_object**) + 167
2   libobjc.A.dylib               	0x00007fff201cf33e objc_autoreleasePoolPop + 161
3   com.apple.CoreFoundation      	0x00007fff203e91e0 _CFAutoreleasePoolPop + 22
4   com.apple.Foundation          	0x00007fff21184e01 -[NSAutoreleasePool drain] + 129
5   QtCore                        	0x0000000119ef41e8 QMacAutoReleasePool::~QMacAutoReleasePool() + 40
6   libqcocoa.dylib               	0x000000012509f7a8 0x12508b000 + 83880
7   QtGui                         	0x000000011ae22f27 QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) + 1207
8   QtWidgets                     	0x000000011a6d97ee 0x11a6c1000 + 100334
9   QtWidgets                     	0x000000011a6ddaa2 0x11a6c1000 + 117410
10  QtWidgets                     	0x000000011a72e5c4 0x11a6c1000 + 447940
11  QtWidgets                     	0x000000011a72b944 0x11a6c1000 + 436548
12  QtWidgets                     	0x000000011a6d167d QApplicationPrivate::notify_helper(QObject*, QEvent*) + 269
13  QtWidgets                     	0x000000011a6d2a82 QApplication::notify(QObject*, QEvent*) + 594
14  QtWidgets.so                  	0x000000011a35c3ca sipQApplication::notify(QObject*, QEvent*) + 234
15  QtCore                        	0x0000000119e12324 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212
16  QtGui                         	0x000000011ac9a115 QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) + 309
17  QtGui                         	0x000000011ac780e3 bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 115
18  QtGui                         	0x000000011ac7f0c2 void QWindowSystemInterface::handleExposeEvent(QWindow*, QRegion const&) + 178

Why Spyder IDE is not opening?

Can I install Spyder without Anaconda?