It is, specifically, go to your cgi-bin directory, then change to calendarscript/templates/admin/<Your Language Here>, open feedback.html and search for 3.2. Change both instances in the form.
For instance, for the English language, make it look ike so...
<TR>
<TD ALIGN="left">
<FORM ACTION="http://www.CalendarScript.com/support/checkversion.pl" ME$
Your version: 3.21
<INPUT TYPE="hidden" NAME="VERSION" VALUE="3.21">
<INPUT TYPE="submit" CLASS="button" VALUE="Check For Update">
</FORM>
</TD>
</TR>