When following through your steps, I got these errors
What am I doing wrong >.<
dragon@dragon-Y520:/media/dragon/6c5cb7b0-a72a-4b65-819c-7e066e4483af/osu-wine$ sudo ./install.sh
INFO: Checking dependencies...
INFO: Installing icons...
cp: cannot create regular file '//usr/share/icons/hicolor/1024x1024/apps/osu-wine.png': No such file or directory
WARN: Couldn't install 1024x1024
chmod: cannot access '//usr/share/icons/hicolor/1024x1024/apps/osu-wine.png': No such file or directory
WARN: chmod icons failed
INFO: Installing desktop files...
INFO: Installing main script...
INFO: Installing config files...
WARN: Not installing user config file! To do so, please run this command post installation:
WARN: cp /etc/osu-wine.conf ~/.osu-wine.conf
INFO: Installation completed. Run 'osu-wine' to install.
dragon@dragon-Y520:/media/dragon/6c5cb7b0-a72a-4b65-819c-7e066e4483af/osu-wine$ osu-wine
/usr/bin/osu-wine: line 35: 7ZBIN=7za: command not found
/usr/bin/osu-wine: line 36: 7ZBIN=7zx: command not found
INFO: Checking dependencies...
INFO: Installing icons...
cp: cannot create regular file '//usr/share/icons/hicolor/1024x1024/apps/osu-wine.png': No such file or directory
WARN: Couldn't install 1024x1024
chmod: cannot access '//usr/share/icons/hicolor/1024x1024/apps/osu-wine.png': No such file or directory
WARN: chmod icons failed
INFO: Installing desktop files...
INFO: Installing main script...
INFO: Installing config files...
WARN: Not installing user config file! To do so, please run this command post installation:
WARN: cp /etc/osu-wine.conf ~/.osu-wine.conf
INFO: Installation completed. Run 'osu-wine' to install.
dragon@dragon-Y520:/media/dragon/6c5cb7b0-a72a-4b65-819c-7e066e4483af/osu-wine$ osu-wine
/usr/bin/osu-wine: line 35: 7ZBIN=7za: command not found
/usr/bin/osu-wine: line 36: 7ZBIN=7zx: command not found