Problem with Lyx

HASAN <[email protected]>
Newsgroups gmane.editors.lyx.documentation
Message-ID <[email protected]>
Dear Sir / Madam I have installed Lyx 2.3.3-2 and there was a problem. There was message box which told me that amsart.cls is not exists, so the program is not producing pdf. I have windows 8.1. Please, could you advise me how can I fix this problem?

Kind regardsHasan
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