"used export manager" is not precise enough. I don't know at what site your looking at all. Many sites offer RIS export through some tool called "export" in one way or another. We'd really need a link to say more.
Zotero's RIS import hasn't changed in a long time. If this used to work, the change is on the library's (though I'm still not sure if this is actually the library or just a database accessed through the library) side and you should report to them.
I'd suggest troubleshooting that. EBSCO should certainly import correctly, but we'd need at a minimum a URL and ideally the database(s) and search string(s) used.
Zotero's RIS import hasn't changed in a long time. If this used to work, the change is on the library's (though I'm still not sure if this is actually the library or just a database accessed through the library) side and you should report to them.