[Zubersoft]

If you contact me at mike@zubersoft.com, I can help you with your orders. What you will need to do is go to Settings->Backup and Restore->Backup Library, generate a .msb file in a safe location like the Downloads folder, then uninstall MobileSheets (and make sure to uncheck the option to save data, you absolutely must not save the data), then you can run the FastSpring e-ink installer. When prompted, enter the license key and then restore your library under Settings->Backup and Restore->Restore Library from Backup. That will restore absolutely everything, including all your annotations. 

I would strongly recommend the e-ink version over the standard Google Play version. There are a lot of issues you will encounter if you use the Google Play version, and you will also miss out on all the BOOX specific optimizations.

Mike