How best to collect money from an LLC?

Assuming you mean that the LLC was administratively dissolved by the Secretary of State, you may still pursue your claim against the company for non-payment. And even if the dissolution was a true, voluntary dissolution, you would most likely have a claim against the owner for dissolving the company with outstanding debt, which is considered a fraudulent transfer. If you would like to discuss any issues further, please feel free to contact my office.  The link to my contact information is below.  Thank you. The foregoing is general information only, not specific legal advice. No attorney/client relation has been created or should be implied.

If  the LLC is dissolved, then your debt is effectively gone and you cannot collect. You say that the promissory note was with the LLC, with no personal guaranty. That means that only the LLC was obligated on the note. If the LLC still existed, you could try to collect by suing, getting a judgment against it, then levying on a bank account, executing on property (e.g. office equipment, vehicles, inventory), etc. But if the LLC has been dissolved, then there is no one remaining who owes you the money--you can't collect from a defunct LLC, and you can't collect from its owner without a personal guaranty.