No hash sums provided for legacy apps

Good day,

Firstly, I'm wondering where can I find hash sums (MD5/SHA256) of some legacy portable apps which do not have dedicated "legacy" pages like Firefox/Chrome? I'll explain what I mean. Let's say if we visit this page:

https://portableapps.com/apps/graphics_pictures/krita-portable

we can see SHA256 Hash for a current (newest) version which is v5.2.2, but there are no hashes provided for older/legacy versions, in this situation: Windows 7/8 64-bit: v5.0.6, Windows 7/8/10 32-bit: v4.4.3.

Here is the list of some pages (there are more) that do not have hashes provided for legacy apps:
https://portableapps.com/apps/graphics_pictures/krita-portable
https://portableapps.com/apps/graphics_pictures/xnview-mp-portable
https://portableapps.com/apps/internet/hexchat-portable
https://portableapps.com/apps/music_video/audacity_portable
https://portableapps.com/apps/office/cherrytree-portable
https://portableapps.com/apps/utilities/zint_barcode_studio_portable

Secondly, do "xxxxxxxxxxxxxx.paf.exe" file format has some INTERNAL verification of integrity of files, like CRC32? For example, If I open corrupted portable file, it will not run at all or will run but display an error so no errors, even the smallest ones will not go unnoticed.

Thanks for the answers,
Mikey