Hi Ayet ,

Thanks for reaching out. I see you're looking to upgrade from Sage 50 Pro to Premium and want to know if you can open your Pro data file in Premium.

Good news! The Pro Edition data file is compatible with both Sage 50 Premium and Quantum Editions. You can open and upgrade your Pro data file in the Premium Edition without any issues.

Just a heads-up, once you've upgraded to a higher format, the data file can't be opened in a lower edition of the software. Also, the upgrading process is irreversible, meaning you cannot downgrade to a lower format once done.

Here are the basic steps for upgrading from Pro to Premium:

1. Open any Sage 50 file as sysadmin in single-user mode.
2. Select Help, then 'Upgrade your Sage 50 product.'
3. Enter the new serial number for the Premium edition and follow the prompts.

Before proceeding, always ensure you have a backup of your data. For detailed instructions and more information, see the links above. If this helps please mark it as verified :)

Warm Regards,
Erzsi