Bloom 5.0 and higher requires .NET Framework 4.7.1 or higher.
Most users will already have this on their computers and if not, Bloom should try to install it; but there are a handful of users who will need to install it themselves.
We recommend installing .NET Framework 4.8 which is the latest.
You can get it from Microsoft here.
Having trouble installing .NET Framework?
Turbo Tax has a good set of .net troubleshooting tips . The particular versions they reference aren’t relevant to Bloom, but the troubleshooting is. Raymond.cc has an an even more exhaustive list of troubleshooting and repair tools .