Check Dumper.lua from https://github.com/JETImodel/Lua-Apps

github.com/JETImodel/Lua-Apps/blob/maste...%20Dumper/Dumper.lua doesn't work with 4.28.
local function initForm never calls exportFiles().
Using for example a more basic function initForm solves the problem:

local function initForm(formID)
form.addRow(2)
form.addLabel({label="Compiled apps"})
local res = form.question("Really compile apps?", "", "", 0, false, 0)
if (res == 1) then
exportFiles()
end
end

oops, sorry. Didn't understand that 'ok' button is not enough, 'enter' must be used first.
Please ignore.