Oops, I am sorry, I forgot that we had the version 1.4. I rather thought about MC where the 1.5 appears right after 1.0.
I am sorry for the imcomatibility but the serious difference between 1.0 and 1.4 made it virtually impossible to provide compatibility at that time.
We are making our best to reduce incompatibility possibilities in the future.
Regards,
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Mateusz Wozniak
PSPaudioware.com