... so BugTracker.NET "Classic", which was born in 2001 and is still alive going into 2021, should be fine for the next few years.
So, about BugTracker.NET "Classic":
A web-based bug or issue tracker written using .NET 4.x Framework, ASP.NET, C#, and SQL Server (SQL Server Express too). Probably has all the features you need. Easy to setup. Power and flexibility when you need it. Learn more at http://ifdefined.com/bugtrackernet.html