After update, XnView cannot execute - requires CPU with sse4.2

[Sprintdriver]

My workspace (Optiplex 780) that have working well in many years for storing multimedia and for simple editing. Including using XnView MP.

However after latest software update (today) - XnView fails to execute. No windows, no nothing.

Starting from terminal gives this error message

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$ /usr/bin/flatpak run --branch=stable --arch=x86_64 --command=xnview --file-forwarding com.xnview.XnViewMP
Incompatible processor. This Qt build requires the following features:
    sse4.2 popcnt

That I have understood (from web search) means XnView now require the CPU having sse4.2 flag. That is kind of stupid because I don't want to toss the computer just because of this.

So the question - Is there a workaround for this issue?

System info

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System:
  Kernel: 7.0.0-38-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 clocksource: tsc
  Desktop: Cinnamon v: 6.6.9 tk: GTK v: 3.24.41 wm: Muffin v: 6.6.3 vt: 7 dm: LightDM v: 1.30.0
    Distro: Linux Mint 22.3 Zena base: Ubuntu 24.04 noble
Machine:
  Type: Desktop System: Dell product: OptiPlex 780 v: N/A serial: <superuser required> Chassis:
    type: 6 serial: <superuser required>
  Mobo: Dell model: 0C27VV v: A01 serial: <superuser required> uuid: <superuser required>
    BIOS: Dell v: A15 date: 08/06/2013
CPU:
  Info: dual core model: Intel Core2 Duo E8400 bits: 64 type: MCP smt: <unsupported> arch: Penryn
    rev: A cache: L1: 128 KiB L2: 6 MiB
  Speed (MHz): avg: 2992 min/max: N/A cores: 1: 2992 2: 2992 bogomips: 11969
  Flags: ht lm nx pae sse sse2 sse3 sse4_1 ssse3
Graphics:
  Device-1: Intel 4 Series Integrated Graphics vendor: Dell 4 driver: i915 v: kernel arch: Gen-5
    ports: active: HDMI-A-1 empty: DP-1,VGA-1 bus-ID: 00:02.0 chip-ID: 8086:2e12 class-ID: 0300
  Device-2: HP ScanJet 3400cse driver: N/A type: USB rev: 1.0 speed: 12 Mb/s lanes: 1
    bus-ID: 1-1:2 chip-ID: 03f0:0405 class-ID: 1001 serial: <filter>
  Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X: loaded: modesetting
    unloaded: fbdev,vesa dri: crocus gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22") s-diag: 582mm (22.93")
  Monitor-1: HDMI-A-1 mapped: HDMI-1 model: BenQ G2420HD serial: <filter> res: 1920x1080 hz: 60
    dpi: 92 size: 531x299mm (20.91x11.77") diag: 609mm (24") modes: max: 1920x1080 min: 720x400
  API: EGL v: 1.5 hw: drv: intel crocus platforms: device: 0 drv: crocus device: 1 drv: swrast
    gbm: drv: crocus surfaceless: drv: crocus x11: drv: crocus inactive: wayland
  API: OpenGL v: 4.5 compat-v: 2.1 vendor: intel mesa v: 25.2.8-0ubuntu0.24.04.4 glx-v: 1.4
    direct-render: yes renderer: Mesa Intel Q45/Q43 (ELK) device-ID: 8086:2e12
  API: Vulkan v: 1.3.275 layers: 3 surfaces: xcb,xlib device: 0 type: cpu driver: N/A
    device-ID: 10005:0000
Audio:
  <snip the rest as is assumed not important for this issue>

[xnview]

1.12.x uses now Qt6 which requires sse4.2, so you can't only use the 1.11.7