I'm having the same issue as EvanNave55. After i hit "Download all files" I extracted each one to the MSE\data folder. 
I also tried reinstalling with 0 templates from MSE; Only your templates. Same error as before. I feel like I'm close..Any advice?
EDIT: I might have figured it out. It seems that extracting the zip file "Spellbook.mse-game" into \data made a Folder in a Folder (example: C:\Magic Set Editor 2\data\Spellbook.mse-game\Spellbook.mse-game).
Once i deleted the redundant folder (example C:\Magic Set Editor 2\data\Spellbook.mse-game) the cards seemed to populate in MSE correctly!
				
			I also tried reinstalling with 0 templates from MSE; Only your templates. Same error as before. I feel like I'm close..Any advice?
EDIT: I might have figured it out. It seems that extracting the zip file "Spellbook.mse-game" into \data made a Folder in a Folder (example: C:\Magic Set Editor 2\data\Spellbook.mse-game\Spellbook.mse-game).
Once i deleted the redundant folder (example C:\Magic Set Editor 2\data\Spellbook.mse-game) the cards seemed to populate in MSE correctly!
			
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