concrete5 Environment Information
# concrete5 Version
5.7.2.1
# concrete5 Packages
Fundamental (1.0.4), Like This (0.9.1).
# concrete5 Overrides
languages/da_DK, languages/fi_FI, languages/tr_TR, languages/it_IT, languages/de_DE, languages/ru_RU, languages/sv_SE, languages/el_GR, languages/ja_JP, languages/nl_NL, languages/fr_FR, languages/sl_SI
# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).
# Server Software
Apache/2.2.15
# Server API
apache2handler
# PHP Version
5.4.44
# PHP Extensions
apache2handler, bz2, calendar, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, odbc, openssl, pcre, PDO, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, Reflection, session, shmop, SimpleXML, snmp, sockets, SPL, sqlite3, standard, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib.
# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 128M
post_max_size - 20M
sql.safe_mode - Off
upload_max_filesize - 20M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 1440
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http://documentation.concrete5.org/editors/in-page-editing/the-tool...
Page versions are not controlled by themes. This is core functionality that is controlled by concrete5.
As for being able to upgrade the theme... later versions require more up to date versions of concrete5 then it looks like you are running. For instance our latest version (3.0.5) require concrete5 5.7.5.