@chawoobie Sometimes you just have to go to google and search the site name, then the link will work. Sometimes I have that problem to but also the link you provided is http:// and when I made it work it started with https://

@fckopera If you really want an old version go to github.com/gorhill/uBlock and manually download 1.64.0 (or whatever other version you want) by going to the releases section and downloading it.
then unzip it in file explorer.
then go to opera://extensions and turn on developer mode (top right) and then press "unpack extension" and open the unzipped folder but you need to go one folder deeper, (if you don't, it won't load)

@privateperfection: it's technically not an adblocker, but it blocks ads

@balayooong: 117 is the opera version, not ublock