Strange. I installed the 64bit version on two different machines and they startet right away. Could you provide the output from console? Maybe there are some additional messages which could help to nail down the problem on your machine.

Ever confirmed: 1 => 0
Status: NEW => UNCONFIRMED

@kalagani
Is this on two separate machines, 64 & 32 bit? Or two VMs on a 64-bit box?
To describe the systems briefly, please post the outputs of
 $inxi -MSD
Wondering whether the dektop matters re previous comment.

I apparently already had 'fio-3.24-2.mga8', and added 'kdiskmark-2.1.0-1.mga8'.
Running 64-bit real hardware from terminal under LXDE:
 $ kdiskmark
showed no further terminal output, but did indeed pop a window saying:
"KDiskMark
No FIO was found. Please install FIO before using KDiskMark"
exactly as reported. Same result from menu.
May try under Plasma.

This application is nursed by wally, so assigning to you. Ask for anything you think might help.

Ever confirmed: 0 => 1
Status: UNCONFIRMED => NEW
CC: (none) => lewyssmith
Assignee: bugsquad => jani.valimaa

Regarding Lewis comment: I testet it on two Plasma machines.

Just re-tried this under Plasma, and the reported error occurs; from menu or terminal - no terminal ouput at all.

@Lewis Smith
yes, I am launching on 2 separates machines, not in VMs!
64 bits with XFCE
inxi -MSD
System:    Host: HPxw9400 Kernel: 5.15.32-desktop-1.mga8 x86_64 bits: 64 Desktop: Xfce 4.16.0 Distro: Mageia 8 mga8 
Machine:   Type: Desktop System: Hewlett-Packard product: HP xw9400 Workstation v: N/A serial: CZC74879RF 
           Mobo: Hewlett-Packard model: 0A1Ch v: D serial: CZC74879RF BIOS: Hewlett-Packard v: 786D6 v04.03 date: 12/10/2009 
Drives:    Local Storage: total: 1.09 TiB used: 845.36 GiB (75.6%) 
           ID-1: /dev/sdc vendor: Seagate model: ST3300655SS size: 279.4 GiB 
           ID-2: /dev/sdd vendor: Seagate model: ST3300655SS size: 279.4 GiB 
           ID-3: /dev/sde vendor: Seagate model: ST3300655SS size: 279.4 GiB 
           ID-4: /dev/sdf vendor: Seagate model: ST3300655SS size: 279.4 GiB

32 bits with Cinnamon
inxi -MSD
System:    Host: KV8 Kernel: 5.15.32-desktop-1.mga8 i686 bits: 32 Desktop: Cinnamon 4.8.3 
           Distro: Mageia 8 mga8 
Machine:   Type: Desktop Mobo: Abit model: KV8 Pro (VIA K8T800P-8237) v: 1.x serial: N/A 
           BIOS: Phoenix v: 6.00 PG date: 04/13/2005 
Drives:    Local Storage: total: 111.79 GiB used: 16.59 GiB (14.8%) 
           ID-1: /dev/sda vendor: Seagate model: ST3120022A size: 111.79 GiB

@sturmvogel, 
like I have a third 64 bits PC under Plasma, I installed the kdiskmark and his dependency fio
rpm -qa --last |grep -E "kdisk|fio"
kdiskmark-2.1.0-1.mga8.x86_64                 ven. 08 avril 2022 11:16:58
fio-3.24-2.mga8.x86_64                        ven. 08 avril 2022 11:16:57

Then launching it is NOK with same error dialog box
"KDiskMark
No FIO was found. Please install FIO before using KDiskMark"

inxi -MSD with Plasma
System:    Host: DellStudio.localdomain Kernel: 5.15.32-desktop-1.mga8 x86_64 bits: 64 Desktop: KDE Plasma 5.20.4 
           Distro: Mageia 8 mga8 
Machine:   Type: Desktop System: Dell product: Studio 540 v: N/A serial: <superuser required> 
           Mobo: Dell model: 0M017G v: A00 serial: <superuser required> BIOS: Dell v: 1.1.3 date: 08/25/2009 
Drives:    Local Storage: total: 540.29 GiB used: 476.84 GiB (88.3%) 
           ID-1: /dev/sda vendor: Western Digital model: WD5000AAKS-00V1A0 size: 465.76 GiB 
           ID-2: /dev/sdb vendor: Maxtor model: STM380811AS size: 74.53 GiB

Thanks for all the system information - especially the variety of hardware & desktops.
I started to wonder whether the error occurs with >1 disc: your 32-bit box (OK) has 1, the two 64-bit boxes (not OK) >1.
Do not know for sturmvogel, but alas, my 64-bit box (not OK) has just 1:
 $ inxi -D
Drives:
  Local Storage: total: 931.51 GiB used: 38.28 GiB (4.1%) 
  ID-1: /dev/sda vendor: Seagate model: ST1000DM003-9YN162 size: 931.51 GiB
kdiskmark-2.1.0-1.mga8
fio-3.24-2.mga8

So we are stuck with the fault occuring often, but not always; and it does not depend on the number of disks nor desktop. I found nothing with an Internet search.

Summary: kdiskmark not run in 64 bits while run in 32 bits => kdiskmark often does not run in 64 bits "No FIO found", while runs in 32 bits
CC: lewyssmith => (none)

I could not recreate the problem. On two x86-64 and one aarch64 systems.
[dave@x3 ~]$ inxi -D
Drives:    Local Storage: total: 3.11 TiB used: 410.38 GiB (12.9%) 
           ID-1: /dev/sda vendor: Western Digital model: WD10EZEX-00RKKA0 size: 931.51 GiB 
           ID-2: /dev/sdb vendor: OCZ model: AGILITY4 size: 238.47 GiB 
           ID-3: /dev/sdc vendor: Kingston model: SEDC400S37960G size: 894.25 GiB 
           ID-4: /dev/sdd vendor: Intel model: SSDSC2BW240A4 size: 223.57 GiB 
           ID-5: /dev/sde vendor: Kingston model: SEDC400S37960G size: 894.25 GiB

[dave@x8t ~]$ inxi -D
Drives:    Local Storage: total: 1.37 TiB used: 189.2 GiB (13.5%) 
           ID-1: /dev/nvme0n1 vendor: Seagate model: Star Drive PCIe SSD size: 447.13 GiB 
           ID-2: /dev/nvme1n1 vendor: Intel model: SSDPEKNW010T8 size: 953.87 GiB

[dave@rp4 ~]$ inxi -D
Drives:    Local Storage: total: 29.54 GiB used: 12.48 GiB (42.3%) 
           ID-1: /dev/mmcblk0 model: LX32G size: 29.54 GiB

CC: (none) => davidwhodgins

Hi,
I discovered the difference between 64 and 32 bits when I wanted to upgrade an old PC with a 32 bit processor, Mageia8/Cinnamon 32 on an IDE HD.
As the motherboard was able to do it, I changed the processor to 64bit and installed Mageia8/XFCE in 64bit on a SATA HD.
On this new configuration I also have the same error

on the old PC now with MGA8/XFCE 64 bits on a SATA DD
(previously MGA8/Cinnamon 32 bits on a IDE DD like in Comment 5)
inxi -MSD
System:
  Host: localhost Kernel: 5.15.32-desktop-1.mga8 x86_64 bits: 64 
  Desktop: Xfce 4.16.0 Distro: Mageia 8 mga8 
Machine:
  Type: Desktop Mobo: Abit model: KV8 Pro (VIA K8T800P-8237) v: 1.x 
  serial: <superuser required> BIOS: Phoenix v: 6.00 PG date: 04/13/2005 
Drives:
  Local Storage: total: 153.38 GiB used: 15.44 GiB (10.1%) 
  ID-1: /dev/sda vendor: Hitachi model: HDS722516VLSA80 size: 153.38 GiB 

kdiskmark-2.1.0-1.mga8.x86_64                 mer. 16 mars 2022 21:11:52
fio-3.24-2.mga8.x86_64                        mer. 16 mars 2022 21:11:52