Версия языка PHP 5.2 доступна на всех тарифах хостинга cPanel hosting.
Как изменить версию PHP написано в статье Выбор версии PHP.

PHP 5.2 (количество модулей 138): apc, apm, ares, bcmath, bcompiler, big_int, bitset, bloomy, bz2, bz2_filter, calendar, coin_acceptor, crack, ctype, curl, date, dba, dbase, dbx, dom, doublemetaphone, eaccelerator, enchant, exif, ffmpeg, fileinfo, filter, ftp, gd, gender, geoip, geos, gettext, gmagick, gmp, gnupg, haru, hash, hidef, htscanner, http, huffman, iconv, idn, igbinary, imagick, imap, inclued, inotify, interbase, intl, ioncube_loader, ioncube_loader_4, json, ldap, libxml, lzf, magickwand, mailparse, mbstring, mcrypt, memcache, memcached, mhash, mongo, msgpack, mssql, mysql, mysqli, ncurses, oauth, odbc, opcache, openssl, pcntl, pcre, pdf, pdo, pdo_dblib, pdo_firebird, pdo_mysql, pdo_oci, pdo_odbc, pdo_pgsql, pdo_sqlite, pgsql, phar, posix, pspell, quickhash, radius, rar, readline, recode, redis, reflection, rsync, session, shmop, simplexml, snmp, soap, sockets, sourceguardian, spl, spl_types, sqlite, ssh2, standard, stats, stem, stomp, suhosin, sybase_ct, sysvmsg, sysvsem, sysvshm, tidy, timezonedb, tokenizer, translit, uploadprogress, uuid, wddx, xcache_3, xdebug, xhprof, xml, xmlreader, xmlrpc, xmlwriter, xrange, xsl, yaf, yaz, zend_optimizer, zip, zlib