problem with Imap-Pop3_email module in MX 7.5.1

Good morning,

I am updating my project to Mx 7.5.1

I have installed the Imap-Pop3_email module from the app store but i get an error on the field Size in entity Attachment  that it is already excisting in System.FileDocument.

I have already updated the module from the app store but i still have the error.

When i change the name to Size to SizeAttachment i get java errors that int cannot be converted to long.

Does anybody have an solution for this?

Thanks