Hi,

Fresh install of OSSN on Ubuntu 20.04 Focal, Apache 2.4.41, PHP 7.4.
Followed the steps to take BEFORE installing on PHP 7.4 (Adjust the 2 code chunks) although this issue happens anyway.

Install completes -> login as admin -> Components -> installer.
Pick textarea-support-2.7.zip (freshly downloaded)
Uploads and installs fine.
Go to enable -> http 500 complete website crash.
Request; (hostname masked)

GET /action/admin/cache/flush?ossn_ts=1591965383&ossn_token=3bc2fe021f4475d7ac3b55afa1459009 HTTP/1.1
Host: xxxx
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Upgrade-Insecure-Requests: 1
DNT: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://xxxx/administrator/components
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en;q=0.9,nb-NO;q=0.8,nb;q=0.7,en-US;q=0.6
Cookie: PHPSESSID=pgn78vps0asa6kd01550eitink; ossn_chat_bell=off

Response;

HTTP/1.0 500 Internal Server Error
Date: Fri, 12 Jun 2020 12:36:23 GMT
Server: Apache/2.4.41 (Ubuntu)
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Content-Length: 0
Connection: close
Content-Type: text/html; charset=UTF-8

I can recover the system by deleting the components folder via SSH and the system restores.
I can then try to do it again, but this 500 response comes over and over.

Apache2 logs are clean and gives no indication of problems.
Where do I begin to troubleshoot this?

[PHP Modules]
calendar
Core
ctype
curl
date
dom
exif
FFI
fileinfo
filter
ftp
gd
gettext
hash
iconv
imagick
json
libxml
mbstring
mysqli
mysqlnd
openssl
pcntl
pcre
PDO
pdo_mysql
Phar
posix
readline
Reflection
session
shmop
SimpleXML
sockets
sodium
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlwriter
xsl
Zend OPcache
zip
zlib
Am I missing something? I saw some posts about MCrypt, although this is no longer available in 7.4 I also see no indication OSSN does NOT work entirely on 7.4php

Please help. I've cleared cache and cookies, also used other web-browsers.