...

ptbposter/ptbposter.cls

@@ -151,7 +151,6 @@
 \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

ptbposter/tcb-example1.tex

@@ -4,7 +4,7 @@
 ]{ptbposter}
 
 \usepackage[
-%,boxlayout=0
+%,boxlayout=0 % 0, 1, 2, 3 -- default: 2
 ]{ptbposter-tcb} 
 
 \phone{+49-30-3481-7316}

ptbposter/tcb-example2.tex

@@ -5,7 +5,7 @@
 ,layout2018
 ]{ptbposter}
 \usepackage[
-boxlayout=2 % 0, 1, 2, 3 # default: 2
+boxlayout=2 % 0, 1, 2, 3 -- default: 2
 ]{ptbposter-tcb}
 
 \phone{+49-30-3481-7316}