No need to apologise, I hope you'll feel better soon ! Thank you for your answer, it's indeed a little bit clearer. For the palette generator, I get the following error when using "Get Brush Color" :
/home/user/.config/aseprite/extensions/brush-manager-pro/brush_ui.lua:978: attempt to call a nil value (field 'UpdateToolsRandColor')
And for the live preview, + and - do work, but not alt + mouse drag. I think it's a limitation of aseprite itself tho (since the custom brush has to be scaled by x2, x4 and so on...), so nothing to do about it.
Anyway, I feel like your tool would greatly benefit from a documentation or tutorial of sort. It's obvious you worked really hard on it and that it has a lot of useful features, so much in fact it can be quite overwhelming in the beginning. I've spent ten minutes trying to understand why Tools > Random Modes > Color did nothing before understanding you first have to set the color range in Settings > Color Jitter > Hue/Sat. It's very logical in itself but having the option and its setting in two different windows can be confusing (especially with different names, random color vs color jitter). If you need a stupid idiot to look for other confusing stuff of the sort, I happen to be one and can gladly give out feedback.
Anyway, it's nothing urgent so please take care of yourself first.
(Also, I really love your profile picture. Do you post your art somewhere ?)