1) Login to Edwiser
2) Head to “My account" page
3) Click on “View details and downloads” associated with RemUI Purchase
On the new page, you will find the link to Download the latest version of Edwiser RemUI theme.

Once you download Edwiser RemUI version for Moodle 3.6 or 3.5 or 3.4 you have to extract the main zip file.

(This contains three files one is for Edwiser RemUI theme file, second is Edwiser RemUI Block plugin and third is Edwiser RemUI Course Format plugin. You need to override the previous file with the new one.)

If you are Edwiser RemUI version for Moodle 3.3 then you will find only one file and you can override the previous version with the new one.