Questions[downgrade](server)

I have installed Fedora 25 on a server and need to downgrade php from 7 to 5.6. I have done the following:

dnf remove php
dnf remove php-common
wget https://rpms.remirepo.net/fedora/remi-release-25.rpm
rpm -Uvh remi-release-25.rpm
dnf --enablerepo=remi install php56 php56-php-common php56-php-cli php56-php-mbstring php56-php-mcrypt php56-php-pear php56-php-xml php56-runtime php56-php-mysqlnd

Everything worked fine but now everything is named php56 instead of php and so the system can't find anything. For example:

# php -r "echo 'Current PHP version: ' . phpversion();"
-bash: /usr/bin/php: No such file or directory
# php56 -r "echo 'Current PHP version: ' . phpversion();"
Current PHP version: 5.6.30

How do I take the last step and make everything (including packages) work like before?

I tried creating a symlink as follows, but php code does not run from the web, so the apache->php link is broken.

cd /usr/bin
ln -s /opt/remi/php56/root/usr/bin/php php

Thanks in advance.

What are the actual steps of downgrading from 2012 R2 to 2008 R2? I'm finding plenty of information on how the licensing works for that, and I understand it all, but can't seem to find any information on the actual downgrade process.

How can I downgrade vsftpd from the latest Ubuntu package (2.3.5) to version 2.3.2?

I have tried to put this into /etc/apt/preferences file:

Package: vsftpd
Pin: version 2.3.2*
Pin-Priority: 1001

However, every time I do sudo apt-get install vsftpd it installs version 2.3.5: vsftpd_2.3.5-1ubuntu2_i386.deb

Is there something else I need to do or am I doing something wrong?

I've updated from 9.10 to 10.04, but unfortunately the PHP provided with 10.04 is not yet supported by zend optimizer.

As far as I understand, I need to somehow replace the PHP 5.3 package provided under 10.04 with an older PHP 5.2 package provided under 9.10. However I'm not sure whether this is the right way to downgrade PHP and if yes, I don't know how to replace the 10.04 package with 9.10 package.

Could you please help me with that?

I need to install Microsoft Office 2003 for some reasons related to compatibility with Luddites.

I can buy an Office 2007 "open license" at the university where I am a faculty member, and I have seen the Microsoft downgrade chart which states that I have downgrade rights.

I can find Office 2003 media.

But how do I get a legitimate license key or activation code for this downgraded version of Office?