I tried Envelope v7.6 on two Macs (with OS X 10.11.6 and 10.12.6).
It crashes on both machines while protecting a application compiled into 4D v15 Volume Desktop.
It seems to be an incompatibility with 4D since an other application was protected correctly.
Process: Envelope [19358]
Path: /Volumes/VOLUME/*/Envelope.app/Contents/MacOS/Envelope
Identifier: com.safenet-inc.Envelope
Version: ???
Code Type: X86 (Native)
Parent Process: ??? [1]
Responsible: Envelope [19358]
User ID: 501
Date/Time: 2018-03-09 17:41:24.789 +0100
OS Version: Mac OS X 10.12.6 (16G1212)
Report Version: 12
Anonymous UUID: 7338F04C-81BC-2949-454B-4A7A5D607F48
Time Awake Since Boot: 9100 seconds
System Integrity Protection: enabled
Notes: Translocated Process
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: Namespace OBJC, Code 0x1
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0xa166a5f6 __abort_with_payload + 10
1 libsystem_kernel.dylib 0xa16668e2 abort_with_payload_wrapper_internal + 65
2 libsystem_kernel.dylib 0xa166689e abort_with_reason + 36
3 libobjc.A.dylib 0xa0cccc59 _objc_fatalv(unsigned long long, unsigned long long, char const*, char*) + 108
4 libobjc.A.dylib 0xa0cccb85 _objc_fatal(char const*, ...) + 33
5 libobjc.A.dylib 0xa0cd62be bad_weak_table(weak_entry_t*) + 28
6 libobjc.A.dylib 0xa0cc2a68 weak_entry_insert(weak_table_t*, weak_entry_t*) + 138
7 libobjc.A.dylib 0xa0cc28e5 weak_register_no_lock + 226
8 libobjc.A.dylib 0xa0cc2685 objc_storeWeak + 312
9 com.apple.Foundation 0x95a0edd9 storeARCWeakAt + 39
10 com.apple.Foundation 0x95a09adb -[NSConcreteMapTable assign:key:value:isNew:] + 168
11 com.apple.Foundation 0x95a099f8 -[NSConcreteMapTable setObject:forKey:] + 92
12 com.apple.AppKit 0x91fa075c +[NSDisplayCycle currentDisplayCycle] + 191
13 com.apple.AppKit 0x92008196 -[NSDisplayCycleObserver setNeedsDisplay:] + 34
14 com.apple.AppKit 0x920080b5 -[NSWindow _postWindowNeedsDisplayUnlessPostingDisabled] + 68
15 com.apple.AppKit 0x92008068 -[NSWindow setViewsNeedDisplay:] + 68
16 com.apple.AppKit 0x92007d29 -[NSWindow _setNeedsDisplayInRect:] + 322
17 com.apple.AppKit 0x91f64f22 NSViewSetNeedsDisplayInRect + 563
18 com.apple.AppKit 0x91f64ce8 -[NSView setNeedsDisplayInRect:] + 35
19 QtGui 0x00a23aa8 QWidgetPrivate::macSetNeedsDisplay(QRegion) + 744
20 QtGui 0x00a23cb6 QWidgetPrivate::update_sys(QRegion const&) + 374
21 QtGui 0x00c9e2ef QWidgetPrivate::repaint_sys(QRegion const&) + 159
22 QtGui 0x00ad8777 QWidget::update(QRect const&) + 199
23 QtGui 0x00ad88a5 QWidget::update() + 69
24 QtGui 0x00a605ef QMacStyle::sizeFromContents(QStyle::ContentsType, QStyleOption const*, QSize const&, QWidget const*) const + 4655
25 QtCore 0x0085eaca QObject::event(QEvent*) + 410
26 QtGui 0x00a8f37c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 188
27 QtGui 0x00a95762 QApplication::notify(QObject*, QEvent*) + 434
28 QtCore 0x0084b93c QCoreApplication::notifyInternal(QObject*, QEvent*) + 108
29 QtGui 0x00a8f4ac QApplication::activeModalWidget() + 156
30 QtGui 0x00a44771 QDesktopWidget::resizeEvent(QResizeEvent*) + 6497
31 com.apple.CoreFoundation 0x9426b996