Trying the latest version 4.6.3, but I also tested it on several older versions and they had the same error. Windows 10, 64 bit.

This is what comes up in the log:

Faulting application name: qbittorrent_4.6.3_x64_setup.exe, version: 4.6.3.0, time stamp: 0x64a0dc67

Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000

Exception code: 0xc0000005

Fault offset: 0x00000000

Faulting process ID: 0x7b5c

Faulting application start time: 0x01da5b5dcd3b728b

Faulting application path: E:\Downloads\qbittorrent_4.6.3_x64_setup.exe

Faulting module path: unknown

Report ID: 2644ec55-01ed-40fa-9337-a30e87d86f97

Faulting package full name:

Faulting package-relative application ID:

Using hit points as a resource very quickly starts to feel less and less like spending health and more and more like you’re spending your Cleric’s spell slots, which isn’t very fun for your Cleric. It works in some other games but I don’t think I’ve ever seen an effective implementation in D&D.

You could maybe get around the begging-for-healing issue by having spells reduce your max HP instead, but I still doubt it would be balanced, it adds a lot of bookkeeping, and you end up getting constantly oneshotted and begging for healing later anyways.