Haroopad is still in beta and has a lot of bugs.
Besides, it seems to be deserted, without any further development. The most annoying bug I have faced with Haroopad is the impossibility to remove it from Windows 10 via "software uninstall" (strange, but the uninstall button was just missing!!!).
For those facing the similar problem - you can remove Haroopad from "AppData\Roaming" folder. My path was the following:
This folder had strange "uninstall.lnk" file, which has solved the problem.
I was enormously glad to remove it, because Haroopad has associated all *.md files with itself (without any warning!!!) - this is another annoying feature of the software.