Index: core/kernel/application.php
===================================================================
--- core/kernel/application.php
+++ core/kernel/application.php
@@ -365,7 +365,7 @@
 			$this->SetVar('m_cat_id', 0);
 		}
 
-		if ( !$this->RecallVar('curr_iso') ) {
+		if ( !$this->RecallVar('curr_iso') && !(defined('IS_INSTALL') && IS_INSTALL) ) {
 			$this->StoreVar('curr_iso', $this->GetPrimaryCurrency(), true); // true for optional
 		}