Do you know you can install wamp server 64-bits 2.2d and wamp server 64-bits 2.4 with in the same computer?

After finishing installing one wamp server you can still install another wamp server with in the same windows computer.

What if you need to shift between different php, apache and mysql version?
Open wamp folder under c:/wamp or any location you have put your wamp. And then open wampmanager.conf. Edit these lines as per your needs

Before changing

[main]
language = english
status = "online"
wampserverVersion = 2.4
wampserverLastKnown = 2.4
installDir = "c:/wamp"
navigator = "C:\Windows\explorer.exe"
defaultLanguage = english


[php]
phpVersion = "5.4.12"
phpLastKnown = 5.4.12
phpIniDir = .
phpConfFile = php.ini
phpExeDir = .


[phpCli]
phpCliVersion = 5.4.12
phpExeFile = php.exe
phpCliFile = php-win.exe


[apache]
apacheVersion = "2.4.4"
apacheLastKnown = 2.4.4
apacheExeDir = bin
apacheConfDir = conf
apacheExeFile = httpd.exe
apacheConfFile = httpd.conf
apacheServiceInstallParams = -n wampapache -k install
apacheServiceRemoveParams = -n wampapache -k uninstall


[mysql]
mysqlVersion = "5.5.20"
mysqlLastKnown = 5.6.12
mysqlConfDir = "."
mysqlConfFile = "my.ini"
mysqlExeDir = "bin"
mysqlExeFile = "mysqld.exe"
mysqlServiceInstallParams = "--install-manual wampmysqld"
mysqlServiceRemoveParams = "--remove wampmysqld"


[apps]
phpmyadminVersion = 4.0.4
sqlbuddyVersion = 1.3.3

webgrindVersion = 1.0

After changing

[main]

language = english

status = "online"

wampserverVersion = 2.4

wampserverLastKnown = 2.4

installDir = "c:/wamp"

navigator = "C:\Windows\explorer.exe"

defaultLanguage = english

[php]

phpVersion = "5.3.10"

phpLastKnown = 5.4.12

phpIniDir = .

phpConfFile = php.ini

phpExeDir = .

[phpCli]

phpCliVersion = 5.3.10

phpExeFile = php.exe

phpCliFile = php-win.exe

[apache]

apacheVersion = "2.2.21"

apacheLastKnown = 2.4.4

apacheExeDir = bin

apacheConfDir = conf

apacheExeFile = httpd.exe

apacheConfFile = httpd.conf

apacheServiceInstallParams = -n wampapache -k install

apacheServiceRemoveParams = -n wampapache -k uninstall

[mysql]

mysqlVersion = "5.5.20"

mysqlLastKnown = 5.6.12

mysqlConfDir = "."

mysqlConfFile = "my.ini"

mysqlExeDir = "bin"

mysqlExeFile = "mysqld.exe"

mysqlServiceInstallParams = "--install-manual wampmysqld"

mysqlServiceRemoveParams = "--remove wampmysqld"

[apps]

phpmyadminVersion = 4.0.4

sqlbuddyVersion = 1.3.3

webgrindVersion = 1.0

if your wamp is started, after saving you need to exit your wamp and start it again for the changes to take place.