All of the theme plugins you cited come in a stock OxS package (meaning OJS and OCS).
If they are not available, they must have been removed by whoever is responsible for maintaining your software.
And there may be a "good" reason for it. You should ask the administrator for the reasons behind the decision of removing the themes.
They will be included back on the next upgrade, anyway, so they'll have to remove them again.
Otherwise, if server permissions allow, you could create a .tar.gz from a stock package of each theme and install them through the plugin installer, if you're using the latest versions.
If not, you'll need SSH/FTP access to the server to upload the folder directly.
Ramón Martins Sodoma da Fonseca
Analista em C&T
Coordenação de Tecnologias de Informação
Instituto Brasileiro de Informação em Ciência e Tecnologia - IBICT
Ministério da Ciência e Tecnologia - MCT