For some reason I cannot install plugin from marketplace using web-interface, there is no 'Install' tab:
Is there something wrong with permissions? Maybe OS of the instance matters (it is a Windows installation)? For example, I do not have this problem with another instance of JIRA installed on Red Hat.
Only a JIRA System Administrator can install a plugin on JIRA. There are a few actions which a JIRA System Administrator can perfrom, but JIRA Administrator cannot perform.
Take a look at this link for details
Since you say that it is a Windows Installation, I am assuming that you are using the JIRA Standalone instance and not OnDemand. Make sure that the user trying to install the plugin has System Administration Permission.
For a JIRA OnDemand instance, you will have to call up Support and ask them to install the plugin on your instance.
Kiran H S
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