Well it seems that I would need to buy it again.
From itch.io documentation
"If you change the minimum price of your project then key holders will still have access to their files. There’s one exception to this rule though: any files that are individually priced.
There are two ways to set a price on your downloadable files: You can set a minimum price on your entire project, or you can individually set a price on files of your choosing "
So it seems that future updates were stopped to anybody who has bought it before. :) Well I can't pay for it 2 time especially that I aren't guaranteed having access to newer versions and because of what is happening with money exchange rates. Sorry.
One more think I would need to pay full price I can't pay only the difference.