Xcode 10.3 not starting on macOS Big Sur

Since I've upgraded to Big Sur Xcode 10.3 which I need is crashed when I try to launch it. I reinstalled to no avail...

Process: Xcode [943]
Path: /Users/USER/Downloads/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 10.3 (14492.2)
Build Info: IDEFrameworks-14492002000000000~2 (10G8)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [943]
User ID: 501

PlugIn Path: /Users/USER/Downloads/Xcode.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
PlugIn Identifier: libMainThreadChecker.dylib
PlugIn Version: ??? (64492.1)

Date/Time: 2020-11-19 13:23:03.155 +0100
OS Version: macOS 11.0.1 (20B29)
Report Version: 12
Bridge OS Version: 5.0.1 (18P2561)
Anonymous UUID: 3A5EAA65-D39F-FA97-D7F6-A9504FA39AEC


Time Awake Since Boot: 1100 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXCBADACCESS (SIGBUS)
Exception Codes: KERNPROTECTIONFAILURE at 0x00007fff237a29b9
Exception Note: EXCCORPSENOTIFY

Termination Signal: Bus error: 10
Termination Reason: Namespace SIGNAL, Code 0xa
Terminating Process: exc handler [943]

VM Regions Near 0x7fff237a29b9:
_TEXT 7fff22c09000-7fff23600000 [ 10.0M] r-x/r-x SM=COW /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit

• ->

TEXT 7fff23600000-7fff23800000 [ 2048K] r-x/rwx SM=PRV /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit Submap 7fff23800000-7fff40000000 [456.0M] r--/rwx SM=PRV process-only VM submap

Application Specific Information:
/Users/tmiskiew/Downloads/Xcode.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib
ProductBuildVersion: 10G8

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libMainThreadChecker.dylib 0x000000011ad0c069 swizzleImplementationFast + 115
1 libMainThreadChecker.dylib 0x000000011ad0bef0 addSwizzler + 165
2 libMainThreadChecker.dylib 0x000000011ad0baec libraryinitializer + 2937
3 dyld 0x000000010e5bfdf5 ImageLoaderMachO::doImageInit(ImageLoader::LinkContext const&) + 321
4 dyld 0x000000010e5c046d ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 29
5 dyld 0x000000010e5bad1a ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 492
6 dyld 0x000000010e5b8b82 ImageLoader::processInitializers(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 188
7 dyld 0x000000010e5b8c22 ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) + 82
8 dyld 0x000000010e5a96a2 dyld::runInitializers(ImageLoader*) + 82
9 dyld 0x000000010e5b4569 dlopeninternal + 609
10 libdyld.dylib 0x00007fff20354fd0 dlopeninternal(char const*, int, void*) + 177
11 libdyld.dylib 0x00007fff2034387e dlopen + 28
12 com.apple.dt.IDEFoundation 0x0000000104617487 IDEInitializeMainThreadChecker + 400
13 com.apple.dt.IDEFoundation 0x0000000104617e99 IDEInitialize + 1038
14 com.apple.dt.IDEKit 0x000000010526e3cd -[IDEApplicationController applicationWillFinishLaunching:] + 622
...

External Modification Summary:
Calls made by other processes targeting this process:
taskforpid: 0
threadcreate: 0
threadsetstate: 0
Calls made by this process:
taskforpid: 0
threadcreate: 0
threadsetstate: 0
Calls made by all processes on this machine:
taskforpid: 543
threadcreate: 0
threadsetstate: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=1.0G resident=0K(0%) swappedoutorunallocated=1.0G(100%)
Writable regions: Total=872.0M written=0K(0%) resident=0K(0%) swappedout=0K(0%) unallocated=872.0M(100%)

Code Block 
 
														VIRTUAL	 REGION 

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 1
Dispatch continuations 128.0M 1
Foundation 16K 1
Kernel Alloc Once 8K 1
MALLOC 131.2M 32
MALLOC guard page 24K 4
MALLOCMEDIUM (reserved) 600.0M 5 reserved VM address space (unallocated)
STACK GUARD 56.0M 4
Stack 9752K 4
VMALLOCATE 916K 12
_CTF 759 1
DATA 35.0M 567
DATACONST 27.4M 340
_DATADIRTY 1829K 217
_FONTDATA 4K 1
_LINKEDIT 526.6M 77
OBJCRO 61.0M 1
_OBJCRW 2468K 2
_TEXT 530.4M 554
UNICODE 588K 1
mapped file 46.9M 10
shared memory 40K 4
=========== ======= =======
TOTAL 2.1G 1840
TOTAL, minus reserved VM space 1.5G 1840

Model: iMac20,2, BootROM 1554.50.3.0.0 (iBridge: 18.16.12561.0.0,0), 8 processors, 8-Core Intel Core i7, 3,8 GHz, 40 GB, SMC
Graphics: kHWAMDRadeonPro5700Item, AMD Radeon Pro 5700, spdisplayspciedevice, 8 GB
Memory Module: Slot 1 (Channel A / DIMM 1), 4 GB, DDR4, 2667 MHz, SK Hynix, HMA851S6DJR6N-VK
Memory Module: Slot 2 (Channel A / DIMM 0), 4 GB, DDR4, 2667 MHz, SK Hynix, HMA851S6DJR6N-VK
Memory Module: Slot 3 (Channel B / DIMM 1), 16 GB, DDR4, 2667 MHz, 0000, unknown
Memory Module: Slot 4 (Channel B / DIMM 0), 16 GB, DDR4, 2667 MHz, 0000, unknown
AirPort: spairportwirelesscardtypeairport_extreme (0x14E4, 0x7BF), wl0: Sep 11 2020 17:01:15 version 9.30.440.2.32.5.61 FWID 01-1d69e4b4
Bluetooth: Version 8.0.1f5, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
USB Device: USB 3.1 Bus
USB Device: Apple T2 Bus
USB Device: Headset
USB Device: Ambient Light Sensor
USB Device: FaceTime HD Camera (Built-in)
USB Device: Apple T2 Controller
Thunderbolt Bus: iMac, Apple Inc., 58.2