Hey, I received the e-mail from the author and he said:
"no an installatiion again and then deinstallation will not work.
the files are still modified for your system and the original are gone
through your reset :-(
what do you mean with splash screen? have a look at the screenshots on
my webpage to tell me which do you mean.
maybe i can help you with an other solution"

So, yeah, I'm running out of options, I just hope he'll get my e-mail as soon
as possible so I don't really have to deal with a bigger problem :)