Important notes when upgrading from LoadSavePNG:

Although the old LoadSavePNG plugin can be used along side the new PNG Utilities, I'd HIGHLY recommend removing LoadSavePNG from your plugins folder and upgrading your projects to use the PNG Utilities API.

The LoadSavePNG module is no longer required and will need to be removed from projects when upgrading to PNG Utilities.

PNG Utilities does not provide "*AndMask" functions (i.e. methods that return the mask ByRef in a separate picture object). The old plugin provided these methods as a fast path to avoid combining the mask within RB itself, whereas PNG Utilities does this within the plugin to break dependancies with the old external RB code module.