Index: openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl,v
diff -u -r1.126.2.22 -r1.126.2.23
--- openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl	19 Aug 2022 10:16:31 -0000	1.126.2.22
+++ openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl	14 Sep 2022 12:33:07 -0000	1.126.2.23
@@ -1026,10 +1026,8 @@
             -arg_list [list from_version_name $upgrade_from_version_name to_version_name $version(name)]
     }
 
-    if {[info commands ::acs::misc_cache] ne ""} {
-        # Flush the installed_p cache
-        acs::misc_cache flush apm_package_installed-$package_key
-    }
+    # Flush the installed_p cache
+    acs::try_cache acs::misc_cache flush apm_package_installed-$package_key
 
     return $version_id
 }
@@ -1242,7 +1240,8 @@
     }
 
     # Flush the installed_p cache
-    acs::misc_cache flush apm_package_installed-$package_key
+    acs::try_cache acs::misc_cache flush apm_package_installed-$package_key
+
     apm_callback_and_log $callback "<p>Done."
 }