1 Download the zip file
Click 'Other browser' and you will download the file mathwallet.zip
Install in Chrome
Open the 'Developer mode'
Drag and drop the mathwallet.zip file into the Extension window.
Then the install is completed.
The same method is working for the browsers such as Firefox, Brave etc.
If you have any other questions, join https://t.me/mathwallet
Note: manually installed version will not upgrade automatically, so you will need to manually install the new version.