InstallationMiwoShop is easily installed as any WordPress plugin. That should be done through your site's backend.
Once you log in, you should open the
Plugins => Add New => Upload section and click on the
[Browse..] button in the
Upload Package File section. Navigate to the same MiwoShop file you have downloaded earlier and select it. Then click on the
[Install Now] button to start the installation.
UpgradeHere you can find more info about the upgrade process.