error by transfering modularity theme with simplerviewer plugin

I want to transfer the good working website from one to the other. exported and imported the dbases. Also with importing without plugins. then one by one activating the plugins. when activating simplerviewer plugin i get error messages.

at home page:
Notice: get_theme_data is deprecated since version 3.4! Use wp_get_theme() instead. in /customers/a/9/5/anjasijben.com/httpd.www/wp-includes/functions.php on line 2908

and with modularity update alerts:
Notice: rss.php is deprecated since version 3.0! Use wp-includes/class-simplepie.php instead. in /customers/a/9/5/anjasijben.com/httpd.www/wp-includes/functions.php on line 2955 Notice: Undefined property: stdClass::$error in /customers/a/9/5/anjasijben.com/httpd.www/wp-includes/rss.php on line 497

If i read correctly i have to upgrade my theme?
Modularity is from graphpaperpress themes 2011 but on the ‘old’ website it works fine. (also wp version 3.9.1) Why should i upgrade on the new website? And I have no guarantee it will work then! I have to pay 99$ to buy the package again….without guarantee whether it will work. Does anybody recognize this problem?

thks! Anja
PS now my website https://www.anjasijben.com links to the ‘old’ website https://www.exima.nl. When anyone knows the problem i can make the problems visible for them.