How to get an older (previous) version of Sparkle

I just fired up Sparkle and it notified me that there was an update. As always I installed it, never presented me with a problem before. But this time it did, an effect that I made by combining a Rounding with a Shadow renders suddenly completely different.

So my question is: can I go back to the previous version? Because I can’t work on this website in this version anymore, because it will screw up my design completely.

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