First of all, great templates -been using them for a while but only just posting for the first time

When I open the TEMPLATE MANAGEMENT page, I get an error at the top of the page:
Unable to write update file include/latest.php Unable to write update file include/all_languages.php Unable to write update file include/local_lang.php
When I try to update a file, I get:
Langusge to update: text_standard_en.php
OK Remote file: is available.
OK Local file: is available.
ERR Copy failed.
Any idas on either issue please ??
Where are the files downloaded to, or are they direct to the server ??
UPDATE: I have chmod o+w my weather directory and the update partially works/fails:
File to update: manage.php
OK Remote file: is available.
OK Local file: is available.
OK Backup file successfull.
Unable to write update file manage.php
ERR Error writing file!!
I'm not happy having to allow o+w access to directories/files, so what needs to be done please ??
TIA.