I have a slavesite wich is deployed to its own directory with templates and images not shared with master site.

When I try to install a new template in the slave site, I just get an error saying I can't install it.

What can be wrong here?
As I understand I should be able to install a template on the slave site without installing it on the master site.

I have tried installing the template on the mastersite and ran the discover tool on the slave site, but no luck.

I use Joomla 2.5 and jms 1.2.75

If you want that a slave site is able to install their own joomla template, you need to specify in the JMS templates rules that the "template folder" = {deploy_dir}/templates

See also the tutorial video 0.b slide 34 for the different variants.
www.jms2win.com/en/tutorial#jms12x-0b

That's what I've done.

So if you correctly setup the "template folder" field, this should work.
If not, I don't see the reason.

If you want that I have a look on your server, this is still possible with our billable support that you can order at
www.jms2win.com/en/joomla-multisite?page...35&category_id=1

I'm getting the same issue, except a blank screen, which I know is a fatal error. Exact same configuration as knutrichard's.

If you send me your test template I will install on my installation as a test. This will confirm one way or another if it is our template or another configuration issue. My template did install on the master, but I have not been able to use any method discussed in the forums to get it installed on my test slave.

Also, I look on the forums and could not locate a definitive set of steps to install a template on a slave, specifically for Joomla 2.5. Could you please point me to it?

Thanks

The procedure to install a "joomla template" in a slave site
1) first create a slave site where you authorize to install joomla template.
See the "template folder" = {deploy_dir}/templates

2) Depending on the template company, the procedure might be different due to specific framework that some company use to bypass the joomla framework.
If you have a company that use the standard joomla framework then you can use the Joomla extension installation to install the template in the slave site.