I can't open or update Keynote

same issue here. i am getting the following error

Process: Keynote [6620]

Path: /Applications/Keynote.app/Contents/MacOS/Keynote

Identifier: com.apple.iWork.Keynote

Version: ???

Build Info: Keynote-6369000000000000~2

Code Type: X86-64 (Native)

Parent Process: ??? [1]

Responsible: Keynote [6620]

User ID: 501

PlugIn Path: (null)

PlugIn Identifier: (null)

PlugIn Version: ??? (551.5)

Date/Time: 2020-11-18 02:38:23.421 -0800

OS Version: Mac OS X 10.13.6 (17G14042)

Report Version: 12

Anonymous UUID: 37EF2BDD-7613-971C-5F89-47F36C7AAD53

Time Awake Since Boot: 1300 seconds

System Integrity Protection: enabled

Crashed Thread: 0

Exception Type: EXC_CRASH (Code Signature Invalid)

Exception Codes: 0x0000000000000000, 0x0000000000000000

Exception Note: EXC_CORPSE_NOTIFY

Termination Reason: Namespace CODESIGNING, Code 0x1

kernel messages:

VM Regions Near 0 (cr2):

-->

__TEXT 0000000102524000-0000000103914000 [ 19.9M] r-x/rwx SM=COW

Thread 0 Crashed:

0 ??? 0x000000011255119c _dyld_start + 0

Thread 0 crashed with X86 Thread State (64-bit):

rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x0000000000000000 rdx: 0x0000000000000000

rdi: 0x0000000000000000 rsi: 0x0000000000000000 rbp: 0x0000000000000000 rsp: 0x00007ffeed6dbc40

r8: 0x0000000000000000 r9: 0x0000000000000000 r10: 0x0000000000000000 r11: 0x0000000000000000

r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x0000000000000000 r15: 0x0000000000000000

rip: 0x000000011255119c rfl: 0x0000000000000200 cr2: 0x0000000000000000

Logical CPU: 0

Error Code: 0x00000000

Trap Number: 0

Binary Images:

0x102524000 - 0x103913fff +??? (6369) <2AE79C84-B075-3411-AA65-D8BB899DC57D> (null)

0x112550000 - 0x11259aadf +??? (551.5) <CB9BFB56-4511-36F1-A546-891FF770C01C> (null)

External Modification Summary:

Calls made by other processes targeting this process:

task_for_pid: 0

thread_create: 0

thread_set_state: 0

Calls made by this process:

task_for_pid: 0

thread_create: 0

thread_set_state: 0

Calls made by all processes on this machine:

task_for_pid: 1699

thread_create: 0

thread_set_state: 0

VM Region Summary:

ReadOnly portion of Libraries: Total=21.2M resident=0K(0%) swapped_out_or_unallocated=21.2M(100%)

Writable regions: Total=8660K written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=8660K(100%)

VIRTUAL REGION

REGION TYPE SIZE COUNT (non-coalesced)

=========== ======= =======

STACK GUARD 56.0M 2

Stack 8192K 2

__DATA 5392K 5

__LINKEDIT 980K 3

__TEXT 20.2M 3

shared memory 8K 3

=========== ======= =======

TOTAL 90.5M 12

Model: iMac12,2, BootROM 87.0.0.0.0, 4 processors, Intel Core i5, 2.7 GHz, 16 GB, SMC 1.72f1

Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x8394, 0x393731363437410000000000000000000000

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x8394, 0x393731363437410000000000000000000000

Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x8394, 0x393731363437410000000000000000000000

Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x8394, 0x393731363437410000000000000000000000

AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P

Bluetooth: Version 6.0.7f22, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: WDC WD1001FALS-403AA0, 1 TB

Serial ATA Device: HL-DT-STDVDRW GA32N

USB Device: USB 2.0 Bus

USB Device: FaceTime HD Camera (Built-in)

USB Device: Hub

USB Device: BRCM2046 Hub

USB Device: Bluetooth USB Host Controller

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: IR Receiver

USB Device: Internal Memory Card Reader

Thunderbolt Bus: iMac, Apple Inc., 22.1

Hello there, my wife was having the same issue. We fixed it by uninstalling the app, restarting the Mac and re-installing the app once again from the App Store. Hope this helps.