You can download old IrfanView versions from these sites:
Oldapps.com or Oldversion.com
There were numerous changes, here are only the more important things.
Version 4.53 ( - CURRENT VERSION - )
(Release date: 2019-05-15)
- New effect in Image->Effects menu: Insert Speech Bubbles
- New effect in Image menu: Add Shadow, Shape, Rounded corners, Snowflake etc.
- New effect in Image menu: Add Hexagon (or tiles), Star, Spikes, Heart etc.
- Show mouse zoom magnifier: CTRL+SHIFT + Mouse-move in the image
(mouse wheel zooms within magnifier area, click inside closes it)
- New border effect in "Add Frame" dialog: Broken Edge
- New effect added: Radial Brighten (Effects browser dialog)
- New option in Capture dialog: Draw red circle around cursor
- New option in Advanced batch dialog: Set maximal dimensions for resize
- Profiles option added to Contact Sheet dialog
- Option to read 1 BPP images in RAW dialog
- Command line: /filepattern can be combined with /slideshow
- TIF/PCX/PSD loading bugs fixed (thanks to Apriorit)
- Some PlugIns are changed/updated, please install the newest versions:
Older versions - History]