Hi I am trying to install a new version of Epesi and I ve run on some problems
Conf Apache 2.4.41, php 7.0.33, Mysql 8.0.18 clean install of Wamp server on local machine
Localization Europe/Athens
1) Tried to install Epesi 1.8.2 - 201804 with no error reporting installed and running until i wanted to see calendar
No hour is displayed, cant select date when adding new appointment etc, in user settings dropdown list of time and dates are empty
with error reporting i get the following startup errors about

Type: E_NOTICE (8)
Message: iconv(): Wrong charset, conversion from ' toUTF-8' is not allowed
File: C:\wamp64\www\epesi18\modules\Base\RegionalSettings\RegionalSettingsCommon_0.php
Line=205
error backtrace:
[PHP core called function]
function called: handle_epesi_error(8, "iconv(): Wrong charset, conversion from ' toUTF-8' is not allowed", "C:\wamp64\www\epesi18\modules\Base\RegionalSettings\RegionalSettingsCommon_0.php", 205, Array ("%B", 1577829600, "Ιανουάριος", "LC_COLLATE=el_EL.utf8;LC_CTYPE=el_EL.utf8;LC_MONETARY=el_EL.utf8;LC_NUMERIC=en_EN.utf8;LC_TIME=el_EL.utf8", null, "el"))

File: C:\wamp64\www\epesi18\modules\Base\RegionalSettings\RegionalSettingsCommon_0.php
line 205
function called: iconv("", "UTF-8", "Ιανουάριος")

File: C:\wamp64\www\epesi18\modules\Base\RegionalSettings\RegionalSettingsCommon_0.php
line 281
function called: strftime("%B", 1577829600)

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 468
function called: reg2time("2020-07-11 23:59:59", false)

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 732
function called: hf_timestamp("r.f_date_and_time", "<=", "2020-07-11 23:59:59", false, null)

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 787
function called: hf_multiple(Object (Utils_RecordBrowser_CritsSingle), Array (Object (Utils_RecordBrowser_QueryBuilder), "hf_timestamp"))

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 214
function called: handle_normal_field_crit(Array (#18), Object (Utils_RecordBrowser_CritsSingle))

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 51
function called: build_single_crit_query(Object (Utils_RecordBrowser_CritsSingle))

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 56
function called: to_sql(Object (Utils_RecordBrowser_CritsSingle))

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\QueryBuilder.php
line 32
function called: to_sql(Object (Utils_RecordBrowser_Crits))

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\RecordBrowserCommon_0.php
line 1588
function called: build_query(Object (Utils_RecordBrowser_Crits), Array (), "r.active=1 AND ")

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\RecordBrowserCommon_0.php
line 1605
function called: build_query("phonecall", Object (Utils_RecordBrowser_Crits), false, Array ())

File: C:\wamp64\www\epesi18\modules\Utils\RecordBrowser\RecordBrowser_0.php
line 2750
function called: get_records_count("phonecall", Array (Array (#1), Array (#2), "2020-07-11 23:59:59"))

File: C:\wamp64\www\epesi18\include\module.php
line 924
function called: mini_view(Array ("contact_name", "phone_number", "status"), Array (Array (#1), Array (#2), "2020-07-11 23:59:59"), Array ("ASC", "ASC", "DESC"), Array ("CRM_PhoneCallCommon", "applet_info_format"), Array (0, 15), Array (1, 1, 0, true, false, true, false, false), Array ("Τηλεφωνικές κλήσεις", true, null, true, "body", Array (#0), Array (#0), Array (#1), "5"))

File: C:\wamp64\www\epesi18\include\module.php
line 844
function called: get_html_of_module(Object (Utils_RecordBrowser), Array (Array (#3), Array (#3), Array (#3), Array (#2), 15, Array (#8), "Array (\"Τηλεφωνικές κλήσεις\", true, null, true, \"body\", Array (#0), Array (#0), Array (#1), \"5\")"), "mini_view")

File: C:\wamp64\www\epesi18\modules\CRM\PhoneCall\PhoneCall_0.php
line 65
function called: display_module(Object (Utils_RecordBrowser), Array (Array (#3), Array (#3), Array (#3), Array (#2), 15, Array (#8), "\"Array (\"Τηλεφωνικές κλήσεις\", true, null, true, \"body\", Array (#0), Array (#0), Array (#1), \"5\")\""), "mini_view")

File: C:\wamp64\www\epesi18\include\module.php
line 924
function called: applet(Array (1, 1, 0, true, false, true, false, false), "\"\"Array (\\"Τηλεφωνικές κλήσεις\\", true, null, true, \\"body\\", Array (#0), Array (#0), Array (#1), \\"5\\")\"\"", "5")

File: C:\wamp64\www\epesi18\modules\Base\Dashboard\Dashboard_0.php
line 194
function called: get_html_of_module(Object (CRM_PhoneCall), Array (Array (#8), "\"\"\\"Array (\\"Τηλεφωνικές κλήσεις\\", true, null, true, \\"body\\", Array (#0), Array (#0), Array (#1), \\"5\\")\\"\"\"", "5"), "applet")

File: C:\wamp64\www\epesi18\modules\Base\Dashboard\Dashboard_0.php
line 128
function called: display_dashboard("1")

File: C:\wamp64\www\epesi18\modules\Base\Dashboard\Dashboard_0.php
line 29
function called: dashboard()

File: C:\wamp64\www\epesi18\include\module.php
line 924
function called: body()

File: C:\wamp64\www\epesi18\include\module.php
line 844
function called: get_html_of_module(Object (Base_Dashboard), Array (), "body")

File: C:\wamp64\www\epesi18\include\module.php
line 129
function called: display_module(Object (Base_Dashboard), null, "body")

File: C:\wamp64\www\epesi18\modules\Base\HomePage\HomePage_0.php
line 24
function called: pack_module("Base/Dashboard", null, "body", null)

File: C:\wamp64\www\epesi18\modules\Base\HomePage\HomePage_0.php
line 17
function called: show_home_page(Array ("Base/Dashboard", "body", null, null))

File: C:\wamp64\www\epesi18\include\module.php
line 924
function called: body()

File: C:\wamp64\www\epesi18\include\module.php
line 844
function called: get_html_of_module(Object (Base_HomePage), Array (), "body")

File: C:\wamp64\www\epesi18\modules\Base\Box\Box_0.php
line 142
function called: display_module(Object (Base_HomePage))

File: C:\wamp64\www\epesi18\include\epesi.php
line 246
function called: body()

File: C:\wamp64\www\epesi18\include\epesi.php
line 291
function called: go(Object (Base_Box))

File: C:\wamp64\www\epesi18\process.php
line 38
function called: process("", "0")

If I change the language to English it works fine....

2) Tried to install epesi-190RC_stable_setup same configuration and i get the following during installation after i setup the database.. (database is created but only a few tables are there...

Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in C:\wamp64\www\officev2\include.php on line 18
Fatal error: require_once(): Failed opening required 'vendor/autoload.php' (include_path='.;C:\php\pear;C:\wamp64\www\officev2\modules\Libs\QuickForm/3.2.14-php7') in C:\wamp64\www\officev2\include.php on line 18

tried to run composer update no luck...
database of epesi is created with collation utf8_unicode_ci
All the folder of epesi subfolders etc user "Everyone" has all rights, checked with web file viewer app 777 everywhere

Can you please help me in any of these versions in order to work with php7

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