"His" software I found interesting, but I don't believe he developed it.

The company that owns the intellectual property of Radio Shack, DressBarn, Linens ‘N Things, Modell’s Sporting Goods and Pier 1 Imports has purchased the intellectual property of Stein Mart Inc.Retail Ecommerce Ventures’ subsidiary, Stein Mart Online Inc. submitted the winning bid of $6.02 million at the November 18 court auction.

I submitted a low-ball offer and it got rejected.

You'll need good contact info for them to be able to collect, and ideally the new address for the tenant however which if you don't have can probably be found easily with some online sleuthing/ contacting their employer, skip tracing software, etc. 

They said I won't affect my assets by resetting the software etc.

Hemlane is a property management software.

For existing companies, individuals who own at least 25% of the entity or exercise substantial control over it must submit BOIR to the Financial Crimes Enforcement Network (FinCEN) by December 31, 2024.

The software is going to be very conservative with your write-offs.

I read about it on Reddit and have had it for a year - it does everything more expensive softwares do but for a much lower price. 

If you're really going after probate leads, just use whatever real estate dialers and software there is out there to get these lists for you and just call them.