Make 2 separate backups of your Atrex data, one to the hard drive and one to some type of removable media. This can be done from inside Atrex under Options - Backup/Restore - Backup.
Close Atrex on all computers. In addition, all programs that access the Atrex data need to be closed, including the eCommerce import/export utilities if those are in use.
On the first computer, install Atrex 20 directly over top of your previous Atrex installation.
Start Atrex and when prompted, start the data conversion. Allow the data conversion to complete before continuing further. Make sure Atrex is NOT started on any other systems until the conversion is complete.
If upgrading from Atrex 15 or older, enter your Atrex 20 registration key under Options – Enter Registration Information. If upgrading from Atrex 16 or newer, it will use your existing registration key.
Install Atrex 20 on the remaining computers.
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