I found STAMPDATA.MDB in C:\Users\Don\Documents\StampManage\IMPORT\StampData.mdb .
I also found a STAMPDATA2018.MDB, STAMPDATA2019.MDB and STAMPDATA.MDB.bk1.
BTW, I got the an error when I installed StampManage 2019. See the first attachment.
I also get an error when I Start STAMPMANAGE, either 2018 or 2019. See the second attachment.