diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -142,3 +142,7 @@
 * The twelth version. Added multiple properties mode to the Phonetic.Languages.General.Lines module and related
 module and extended the comparative mode for it up to 7 different input source files. Some documentation improvements.
 
+## 0.12.1.0 -- 2021-09-15
+
+* The twelth version revised A. Fixed issues in the documentation for the installation and upgrading processes.
+
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -76,11 +76,7 @@
 Since the 0.5.0.0 version you can use also "w" and "x" series (lines) of properties. They use more complex
 approach and are intended for 4 elements in the rhythmic groups. For more information, please, refer to the
 section 'WX argument' in the English instruction:
-https://oleksandrzhabenko.github.io/uk/InstructionEng.12.pdf
-
-or here:
-
-https://web.archive.org/web/20210914215340/https://oleksandrzhabenko.github.io/uk/InstructionEng.12.pdf
+https://oleksandrzhabenko.github.io/uk/InstructionEng.12.1.pdf
 
 There are also some additional information there about the changes in the 0.6.0.0 version.
 
diff --git a/phonetic-languages-simplified-generalized-examples-array.cabal b/phonetic-languages-simplified-generalized-examples-array.cabal
--- a/phonetic-languages-simplified-generalized-examples-array.cabal
+++ b/phonetic-languages-simplified-generalized-examples-array.cabal
@@ -3,7 +3,7 @@
 -- http://haskell.org/cabal/users-guide/
 
 name:                phonetic-languages-simplified-generalized-examples-array
-version:             0.12.0.0
+version:             0.12.1.0
 synopsis:            Helps to create texts with the given phonetic properties (e. g. poetic).
 description:         Is rewritten from the modules of the @phonetic-languages-simplified-examples-array@ package. Can be used not only for Ukrainian, but also for other languages.
 homepage:            https://hackage.haskell.org/package/phonetic-languages-simplified-generalized-examples-array