can't guarantee it's 100% working, but it has been working so far for me...if you want a quick fix while you wait, make the following edits...
info.json: change Factorio Version to 1.1
in belt-sorter-gui.lua in the control folder, change line 216 to read param.parameters = slotConfig
info.json will allow it to be loaded under 1.1, saves to be loaded, and existing units will work. The line change in belt-sorter-gui.lua should allow you to actually make changes to the filters without the game crashing. If you've made a lot of other changes in your game since the last save, I recommend saving before trying to use it just to be safe.