blowup-Versionstest

ptbposter/ptbposter.cls

@@ -140,21 +140,36 @@
 
 \@ifundefined{changefontsizes}{%
   \ClassError{ptbposter}{%
-    Deine Version von KOMA-Script ist ungeeignet (vermutlich stark veraltet)!
+    Your version of KOMA-Script is unsuitable\MessageBreak
+    (probably very outdated)!
   }{%
-    Installiere die aktuelle Version von KOMA-Script.
+    Install the latest version of KOMA-Script.
   }%
+  \@@end
 }{}
 
-\ifx\PTB@target@size\@empty\else
-  \RequirePackage{blowup}[2022/09/19]
-  \ClassNoteNoLine{ptbposter}{%
-    Scaling the sheet from size `a0' to size `\PTB@target@size'}%
-  \ifPTBlandscape
-    \blowUp{target=\PTB@target@size,landscape}
-  \else
-    \blowUp{target=\PTB@target@size}
-  \fi
+\ifx\PTB@target@size\@empty\else % Sheet scaling is necessary
+  \RequirePackage{blowup}
+  \IfPackageAtLeastTF{blowup}{2022/09/19}{%
+    \RequirePackage{blowup}%
+    \ClassNoteNoLine{ptbposter}{%
+      Scaling the sheet from size `a0' to size `\PTB@target@size'}%
+    \ifPTBlandscape
+      \blowUp{target=\PTB@target@size,landscape}
+    \else
+      \blowUp{target=\PTB@target@size}
+    \fi
+  }{%
+    \ClassError{ptbposter}{%
+      You need version `2022/09/19' or newer of the \MessageBreak
+      `blowup' package to scale the document, but only \MessageBreak
+      version `\csname ver@blowup.sty\endcsname' \MessageBreak
+      is available
+    }{%
+      Install the latest version of `blowup'.
+    }%
+    \@@end
+  }
 \fi
 
 \iftutex% LuaTeX oder XeTeX

ptbposter/tcb-example1.tex

 \documentclass[%
 ,sanserif
-%,a4paper
+,a4paper
 ]{ptbposter}
 
 \usepackage[