@@ -13,6 +13,7 @@
 * Split Linux CoreCLR CI into two parallel test batches to reduce test turnaround time. ([PR #20587](https://github.com/dotnet/fsharp/pull/20587))
 * Checker: resolve named arguments of failed and unfinished method calls ([PR #20749](https://github.com/dotnet/fsharp/pull/20749))
 * Fix `NativePtr.stackalloc` used inside the `with` handler, filter or `finally` block of a `try` expression producing an assembly that throws `InvalidProgramException` at method load. Direct or mandatory-inline allocations are now reported at compile time as error FS3924; calls to non-inline allocation helpers, including handler-local helpers, remain legal and retain their method boundary during inlining and let-binding elimination. ([Issue #20295](https://github.com/dotnet/fsharp/issues/20295), [PR #20491](https://github.com/dotnet/fsharp/pull/20491))
+* Correct FS3880 guidance in the compiler and F# Interactive to identify .NET SDK 10.0.1xx as the last compatible SDK feature band for out-of-support language versions. ([Issue #20666](https://github.com/dotnet/fsharp/issues/20666), [PR #20795](https://github.com/dotnet/fsharp/pull/20795))
 * Preserve SRTP code generation when extension constraint solutions are disabled. ([PR #20773](https://github.com/dotnet/fsharp/pull/20773))
 * `FsiEvaluationSession.EvalInteraction` and `EvalInteractionNonThrowing` evaluate every `;;`-separated interaction in the text they are given, as their documentation has always said, instead of silently discarding everything after the first. ([PR #20396](https://github.com/dotnet/fsharp/pull/20396))
 * Inline members can now call inline base-class members with optimizations off while retaining debugger step-into. Uneliminated `base` references report FS3925 instead of an internal error. ([Issue #20614](https://github.com/dotnet/fsharp/issues/20614), [PR #20639](https://github.com/dotnet/fsharp/pull/20639))
 
@@ -1747,7 +1747,7 @@ featureExtensionConstraintSolutions,"Allow extension members to participate in S
 featureErrorOnBitwiseOpsOnNonIntegralEnums,"Error when bitwise operators are used on enums whose underlying type is not an integer type (e.g. char)."
 featureOptimizeClosureIfNotInlined,"optimize a curried closure argument when its inlining fails"
 featureRequireNamedArguments,"enforce named arguments at call sites of methods annotated with RequireNamedArgumentsAttribute"
-3880,optsLangVersionOutOfSupport,"Language version '%s' is out of support. The last .NET SDK supporting it is available at https://dotnet.microsoft.com/en-us/download/dotnet/%s"
+3880,optsLangVersionOutOfSupport,"Language version '%s' is out of support. The last compatible SDK feature band is .NET SDK 10.0.1xx. Download it at https://dotnet.microsoft.com/en-us/download/dotnet/%s."
 3881,optsUnrecognizedLanguageFeature,"Unrecognized language feature name: '%s'. Use a valid feature name such as 'FromEndSlicing'."
 3882,lexHashElifMustBeFirst,"#elif directive must appear as the first non-whitespace character on a line"
 3883,lexHashElifMustHaveIdent,"#elif directive should be immediately followed by an identifier"