improved Abaqus installation doc

apps/Abaqus/README.md

@@ -29,26 +29,20 @@ Same for the `CAE commands directory path`, please change the suggested dir `/va
 and for the `SIMULIA Established Products` please change `/var/DassaultSystemes/SIMULIA/CAE/plugins/<Abaqus_version>` to `/fsx/DassaultSystemes/SIMULIA/CAE/plugins/<Abaqus_version>`
 <br><br>
 Even if it works, at the moment [Amazon Linux 2](https://aws.amazon.com/amazon-linux-2/) (AL2) is not one of the supported Operating Systems. 
-<br> If you are planning to install Abaqus on AL2 you need to work around the installer.
-
-This is pretty straightforward as the installer checks the operating system being among the supported ones using `lsb_release`. 
-
-All that's needed is to backup the actual `lsb_release` and then create a new `lsb_release` that just print `CentOS`, once saved, give it execution permissions:
+<br> If you are planning to install Abaqus on AL2 (or in general on an un-supported operating system) you need to work around the installer.
 
 ```bash
-sudo mv /usr/bin/lsb_release /usr/bin/lsb_release_OLD
+export DSY_Force_OS=linux_a64
+export DSYAuthOS_`lsb_release --short --id | sed 's/ //g'`=1
 
-sudo bash -c 'cat <<EOF > /usr/bin/lsb_release
-#!/bin/bash
+..
+...
+#then
 
-echo "CentOS"
-EOF'
+./StartTUI.sh 
 
-sudo chmod +x /usr/bin/lsb_release
 ```
 
-After installation, you can return your backed-up file: `sudo mv /usr/bin/lsb_release_OLD /usr/bin/lsb_release`
-
 **_NOTE:_**  For the full Abaqus installation guide, please refer to the official documentation.
 
 #  Key settings & tips (performance related ones) :