OK I am getting requests for the "other" version I mentioned so if you don't mind I will just go ahead and post it here since Ruben said it was ok.
Ruben's method is to add 10 previous years to the drop down jump box.
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This mod adds the "Previous Year" ----- "Next Year" to the styles template (default or your own)thus resolving the version update re-add issue and other perks.
ADDING "PREVIOUS YEAR ----- NEXT YEAR" link to UBB Calendar version 7.5
Back up all files 1st:
Open ~ templates/default/calendar.tpl and find;
<table width="100%" cellspacing="0">
<tr>
<td align="left" valign="top" width="50%">
<a href="{ubb url="ubb=calendar&month=`$prevmonth`&year=`$prevyear`"}">{$lang.PREVMONTH}</a>
</td>
<td align="right" valign="top">
<a href="{ubb url="ubb=calendar&month=`$nextmonth`&year=`$nextyear`"}">{$lang.NEXTMONTH}</a>
</td>
</tr>
</table>
Replace with:
<table width="100%" cellspacing="0">
<tr>
<td align="left" valign="top" width="33%">
<a href="{ubb url="ubb=calendar&month=`$prevmonth`&year=`$prevyear`"}" alt="{$lang.SEARCHPREVMONTH}">{$lang.PREVMONTH}</a>
</td>
<td align="center" valign="top" width="33%">
<a href="{ubb url="ubb=calendar&month=`$prevmonth+1`&year=`$prevyear-1`"}" alt="{$lang.SEARCHPREVYEAR}">{$lang.PREVYEAR}</a> ----- <a href="{ubb url="ubb=calendar&month=`$nextmonth-1`&year=`$nextyear+1`"}" alt="{$lang.SEARCHNEXTYEAR}">{$lang.NEXTYEAR}</a>
</td>
<td align="right" valign="top">
<a href="{ubb url="ubb=calendar&month=`$nextmonth`&year=`$nextyear`"}" alt="{$lang.SEARCHNEXTMONTH}">{$lang.NEXTMONTH}</a>
</td>
</tr>
</table>
Close and upload:
Open ~ languages/english/calendar.php and find;
above this add;
$ubbt_lang['PREVYEAR'] = "<< Previous Year";
$ubbt_lang['NEXTYEAR'] = "Next Year >>>";
$ubbt_lang['SEARCHPREVYEAR'] = "View Previous Year!";
$ubbt_lang['SEARCHNEXTYEAR'] = "View Next Year!";
$ubbt_lang['SEARCHNEXTMONTH'] = "View Next Month!";
$ubbt_lang['SEARCHPREVMONTH'] = "View Previous Month!";
Make sure there is no white space (extra space) after the ?>
Save and Upload ~ Close all files.
You should see the Links at this point; feel free to customize as you go...
I posted this on the fly so if you have any problems let me know and I will recheck the coding even closer. Should be fine and I have tested both options here repeatedly.