NET Framework error (when starting Keepass). Windows 8.1. What is the reason?

Question

Microsoft

Today keepass stopped opening, writes Net Framework initialization error. Everything was working yesterday.

NET reinstalled.
Reinstalled Keepass.
Net on Win 8.1 is by default, but rearranged. Now 4.5.2 seems to be worth it.

registry

folder in /windows/

Although here are other programs that require NET to open, the same boxcryptor for example. wtf?
It doesn’t open and that’s it, I don’t know where to dig.

Answer 1

1. Check if .Net v2.0 or 3.5 is installed. By default, in Win 8.1 only .Net 4-4.5.
2. Try running Keepass as an administrator.
3. Try running Keepass in compatibility mode for previous versions of Windows.

Answer 2

You don't need to run any installer.
But if "Yesterday everything worked.", then this is unlikely to help.

Answer 3

Try the following trick:
In the folder with the binary, edit or create a file with the name <keepass_binary_with_extension>.config
and add the following lines to it:

<configuration>
   <startup>
      <supportedRuntime version="v2.0.50727"/>
      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
   </startup>
</configuration>