I have Windows 10 working fine on my Inspiron 7537 laptop. Windows 10 Forum mentions TPM 2.0 is needed from end July - see http://www.tenforums.com/windows-10-news/50204-tpm-2-0-must-present-enabled-default-all-new-win-10-p...
Will my laptop run Windows 100 after the next major upgrade due at the end of July?
You do not have a TPM at all - so you cannot use features that require one, but just as is the case now, Windows 10 will run just fine.
You need a TPM 2.0 ONLY for running TPM-based features of Windows in the future.