In the previous installation, I deleted by hands the file config.eo.php
After your reply, I recharged that file declaring 777 all autoloader folder and subfolder. In this case the message was: Edit Orders v4.1 install completed!

But the problem persists.

I have to said that I have excluded the sending mail, in my installation.
(The objective is simply to provide the admin to make quotation).

The other caractheristics, as per your require, are:

What version of Edit Orders? Edit Orders 4.1

What version of Zen Cart? 1.5.1

What order total modules do you have installed?
COD Fee ot_cod_fee
Discount Coupon ot_coupon
Group Discount ot_group_pricing 290
Gift Certificates ot_gv
Low Order Fee ot_loworderfee
Shipping ot_shipping
Sub-Total ot_subtotal 100
Tax ot_tax 300
Total ot_total 999

What order total modules do you have enabled?
Group Discount ot_group_pricing 290
Sub-Total ot_subtotal 100
Tax ot_tax 300
Total ot_total 999

What message did you see at the top of the screen after installing Edit Orders and clicking "Admin Home"?
Edit Orders v4.1 install completed!

What if any Zen Cart error logs exist (/cache/ in 1.5.0 and /logs/ in 1.5.1 - use FTP to look)?
None

What other modifications (plugins, add-ons, etc) have been done?
None