Spell checking is not bundled in the plugin pack v0.17.1. Would it be possible to have spell checking for the Windows binaries please?
Since the spell check plugin uses Enchant as its backend, there are no more Windows builds available.
It still can be compiled and used on Windows but you need the Enchant library for Windows and at least one of the supported spell checking engines like aspell or myspell.
While all necessary components are available for Windows, distributing them is not that easy. You need to copy the various libraries (.dll files) into the correct locations or add many directories to the global PATH environment variable.
I can't spend time on this issue, sorry.
If someone comes up with a sane default distribution of Enchant and one of the engines like aspell, I'd happy to make a spell check binary for Windows. Some time ago, I tried it and got it all working.
The main problem is that even if you installed everything in the correct locations, users still need to install the desired dictionaries which also need to be installed in the correct path.
Just for the archives: Windows builds of the Spell Check plugin are bundled with the geany-plugins installers already since some time.