This time I've tried upgrading httpd and php first from the standard versions on CentOS 7, giving me httpd 2.4.34 instead of 2.4.6 and php 7.2 instead of 5.4. After that, I made another upgrade attempt. It still does not work, but it fails differently from last time.
I now just get an empty page with "Powered by Restyaboard" and no error messages in /var/log/httpd24/error_log (my previous attempt got a reload loop and constant stream of errors that I think had to do with restyaboard not supporting the php version in CentOS 7).
In my html directory I've added the following directories from the 1.7 zip file: api_explorer, client, media, server, sql, tmp, build, docs, and Jelastic. As far as I can tell, the rest are build artifacts, docker stuff or other unrelated things (in my working 0.6.9 installation, I only installed the directories client, media, server, sql, and tmp).
{"access_token":"3a49ca852a2cad593ff5e5071ad027ff8727a69e","expires_in":3600,"token_type":"Bearer","scope":"read","id":"3","links":"[{\"slug\":\"users_forgotpassword\"},{\"slug\":\"load_settings\"},{\"slug\":\"view_board\"},{\"slug\":\"users_login\"}]","languages":"{\"ar\":\"Arabic\",\"ca_ES\":\"Catalan (Spain)\",\"zh\":\"Chinese\",\"zh_CN\":\"Chinese (China)\",\"zh_TW\":\"Chinese (Taiwan)\",\"cs_CZ\":\"Czech (Czech Republic)\",\"da\":\"Danish\",\"nl\":\"Dutch\",\"en_GB\":\"English (United Kingdom)\",\"en_US\":\"English (United States)\",\"fi\":\"Finnish\",\"fr\":\"French\",\"fr_FR\":\"French (France)\",\"gl\":\"Galician\",\"gl_ES\":\"Galician (Spain)\",\"de\":\"German\",\"de_DE\":\"German (Germany)\",\"el\":\"Greek\",\"hi\":\"Hindi\",\"hi_IN\":\"Hindi (India)\",\"hu_HU\":\"Hungarian (Hungary)\",\"it\":\"Italian\",\"ja\":\"Japanese\",\"ko\":\"Korean\",\"nb_NO\":\"Norwegian Bokmal (Norway)\",\"fa\":\"Persian\",\"fa_IR\":\"Persian (Iran)\",\"pl\":\"Polish\",\"pt\":\"Portuguese\",\"pt_BR\":\"Portuguese (Brazil)\",\"ru\":\"Russian\",\"sr\":\"Serbian\",\"sk_SK\":\"Slovak (Slovakia)\",\"sl_SI\":\"Slovenian (Slovenia)\",\"es\":\"Spanish\",\"sv\":\"Swedish\",\"ta\":\"Tamil\",\"ta_IN\":\"Tamil (India)\",\"th\":\"Thai\",\"th_TH\":\"Thai (Thailand)\",\"tr_TR\":\"Turkish (Turkey)\",\"vi_VN\":\"Vietnamese (Viet Nam)\"}","apps":"{\"r_eu_gdpr\":{\"id\":\"r_eu_gdpr\",\"uuid\":\"\",\"name\":\"EU GDPR Cookie Consent Popup\",\"description\":\"The app adds cookie consent widget to Restyaboard instance to make it compliant with European Union General Data Protection Regulation policies.\",\"author\":\"Restya\",\"author_email\":\"
in...@restya.com\",\"author_url\":\"http:\\\/\\\/
restya.com\\\/\",\"version\":\"0.1.2\",\"price\":\"Free\",\"icon\":\"apps\\\/r_eu_gdpr\\\/img\\\/r-eu-gdpr.png\",\"settings_description\":\"\",\"large_description\":[\"The app adds cookie consent widget to Restyaboard instance to make it compliant with European Union General Data Protection Regulation policies.\"],\"assets\":{\"css\":[],\"js\":[\"apps\\\/r_eu_gdpr\\\/js\\\/app.js\"]},\"mutationObservers\":{\"footer\":{\"footer-menu\":\"showCookieInformation\"}},\"enabled\":true},\"r_gmail_addon\":{\"id\":\"r_gmail_addon\",\"uuid\":\"\",\"name\":\"Gmail Add-on\",\"description\":\"Enables Gmail Add-on link so that users can install Restyaboard Gmail Add-on from Gmail Marketplace.\",\"author\":\"Restya\",\"author_email\":\"
in...@restya.com\",\"author_url\":\"http:\\\/\\\/
restya.com\\\/\",\"version\":\"0.1.2\",\"price\":\"Free\",\"icon\":\"apps\\\/r_gmail_addon\\\/img\\\/r-gmail-addon.png\",\"settings_description\":\"\",\"large_description\":[\"- Gmail Add-on keeps your boards and inbox connected for more productivity.\",\"- Access your Restyaboard account from your mail inbox and quickly create new cards on your boards without leaving your inbox.\"],\"assets\":{\"css\":[],\"js\":[\"apps\\\/r_gmail_addon\\\/js\\\/default.cache.js\"]},\"enabled\":true},\"r_hide_card_additional_informations\":{\"id\":\"r_hide_card_additional_informations\",\"uuid\":\"\",\"name\":\"Hide Card Additional Informations\",\"description\":\"To hide the card additional informations like Card created date, Card created user, Card ID and List moved date from cards listing.\",\"author\":\"Restya\",\"author_email\":\"
in...@restya.com\",\"author_url\":\"http:\\\/\\\/
restya.com\\\/\",\"version\":\"0.1.3\",\"price\":\"Free\",\"icon\":\"apps\\\/r_hide_card_additional_informations\\\/img\\\/r-hide-card-additional-informations.png\",\"settings_description\":\"To hide the card additional informations like Card created date, Card created user, Card ID and List moved date from cards listing.\",\"large_description\":[\"- To hide the card additional informations like Card created date, Card created user, Card ID and List moved date from cards listing.\",\"- Disable it in Admin Control Panel for default behavior.\",\"- This is a simple sample App to show the possibilities of App platform.\"],\"assets\":{\"css\":[],\"js\":[\"apps\\\/r_hide_card_additional_informations\\\/js\\\/default.cache.js\"]},\"enabled\":true}}"}