Hi Bogdan, below is the report after attempting to install iThemes Security Pro from .zip.
### Server Info Required Detected Status ###
MainWP Dashboard
MainWP Dashboard Version 4.0.7.2 4.0.7.2 Pass
MainWP Upload Directory Writable Writable Pass
MainWP Extensions
Advanced Uptime Monitor Extension 5.0.2 Active Pass
MainWP Branding Extension 4.0 Active Pass
MainWP Bulk Settings Manager Extension4.0.2 Active Pass
MainWP Clean and Lock Extension 4.0.1 Active Pass
MainWP Client Reports Extension 4.0.3 Active Pass
MainWP Clone Extension 4.0 Active Pass
MainWP Comments Extension 4.0.2 Active Pass
MainWP Custom Dashboard Extension 4.0 Active Pass
MainWP Custom Post Type 4.0.1 Inactive Warning
MainWP Favorites Extension 4.0.2 Active Pass
MainWP File Uploader Extension 4.0 Inactive Warning
MainWP Google Analytics Extension 4.0.3 Active Pass
MainWP iThemes Security Extension 4.0.2 Active Pass
MainWP Maintenance Extension 4.0.1 Active Pass
MainWP Page Speed Extension 4.0.1 Active Pass
MainWP Post Plus Extension 4.0.2 Active Pass
MainWP Pro Reports Extension 4.0 Active Pass
MainWP Rocket Extension 4.0.1 Active Pass
MainWP Staging Extension 4.0 Active Pass
MainWP Sucuri Extension 4.0.5 Active Pass
MainWP Team Control 4.0.1 Active Pass
MainWP UpdraftPlus Extension 4.0.2 Active Pass
MainWP URL Extractor Extension 4.0.1 Active Pass
MainWP Vulnerability Checker Extension4.0.3 Active Pass
MainWP WooCommerce Shortcuts Extension4.0 Active Pass
MainWP WooCommerce Status Extension4.0.1 Active Pass
WordPress
WordPress Version >=3.6 5.4.2 Pass
WordPress Memory Limit >=64M 40M Warning
MultiSite Disabled =true true Pass
FileSystem Method = direct direct Pass
PHP
PHP Version >=5.6 7.3.11 Pass
PHP Safe Mode Disabled =true true Pass
PHP Max Execution Time >=30 seconds 30 Pass
PHP Max Input Time >=30 seconds 60 Pass
PHP Memory Limit >=128M 512M Pass
PCRE Backtracking Limit >=10000 1000000 Pass
PHP Upload Max Filesize >=2M 128M Pass
PHP Post Max Size >=2M 128M Pass
SSL Extension Enabled =true true Pass
SSL Warnings = empty Pass
cURL Extension Enabled =true true Pass
cURL Timeout >=300 seconds 60 Warning
cURL Version >=7.18.1 7.45.0 Pass
cURL SSL Version >=OpenSSL/0.9.8l OpenSSL/1.0.1e Pass
PHP Allow URL fopen YES
PHP Exif Support YES ( V7.3.)
PHP IPTC Support YES
PHP XML Support YES
PHP Disabled Functions No functions disabled.
PHP Loaded Extensions Core, PDO, Phar, Reflection, SPL, SimpleXML, bcmath, bz2, calendar, cgi-fcgi, ctype, curl, date, dom, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, ionCube Loader, json, libxml, mbstring, mysqli, mysqlnd, openssl, pcre, pdo_mysql, pdo_pgsql, pdo_sqlite, pgsql, posix, pspell, session, soap, sockets, sqlite3, standard, tidy, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib
MySQL
MySQL Version >=5.0 10.2.32-MariaDB-log Pass
MySQL Mode NO_ENGINE_SUBSTITUTION
MySQL Client Encoding utf8mb4
Server Info
Server Software Apache
Operating System Linux
Architecture 64 bit
Server Protocol HTTP/2.0
HTTPS ON - on
Server self connect Response Test O.K.
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36
Gateway Interface CGI/1.1
Memory Usage 53 MB
Request Time 1591905537
Accept Content 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
Accept-Charset Content N/A
MainWP Settings
Number Of Child Sites 21
Use WP-Cron Yes
Optimize for Shared Hosting or Big NetworksYes
Automatic Daily Update Install trusted updates
Abandoned Plugins/Themes Tolerance 365
Maximum number of posts to return
Maximum number of pages to return
Maximum Number of Comments 50
Primary Backup System Default MainWP Backups
Maximum simultaneous requests 4
Minimum delay between requests 200
Maximum simultaneous requests per ip1
Minimum delay between requests to the same ip1000
Maximum simultaneous sync requests
Minimum simultaneous install/update requests
Active Plugins
iThemes Security 7.7.1 Active
MainWP Dashboard 4.0.7.2 Active
Ultimate Dashboard 2.8.1 Active
UpdraftPlus - Backup/Restore 2.16.26.24 Active
White Label 2.0.8 Active