Upgrade to the latest version of DW Page theme and WordPress

Hi,
Because, DW Page in our home designwall.com is a bit different from the single theme DW Page modern. So, if you want to upgrade to the latest version of DW Page theme and WordPress, you can go to the \dw-page\wp-content\themes folder then rename the rename the dw-page-modern folder to the dw-page-modern-backup folder.
Then log in to Dashboard > Theme > upload to select the dw-page-1.1.0.zip package to update. After activate the DW Page 1.1.0, you should find here for the document on how to confidure the theme: http://www.designwall.com/guide/dw-page-v-1-1-0/
If you have any question, please let us know.
Hope this helps !

Is it possible to update without losing the customization we made with the older DW Page Modern theme version?

If you don’t want to lose all changes that you customized, before updating the latest version, please mark and copy all files that you edited, then update to the version 1.1.0
After finishing, you add all customized code to your theme.
Note: you can find here for the document guide on how to upgrade the theme.
However, DW Page in our home designwall.com is a bit different from the single theme DW Page modern. After update, you can try copy the code that you edited and add all customized code to your theme. If you have any issue/ question, you can let us know and provide for me username & password of your site (via private answer) I will help you.
Regards,