Well, because I was a lil' bit bored of all the questions how to install this and this, so I coded a Installer for a bunch of 6.XX Tools/HENs and LCFWs ;).

Here's the README:
6.XX Installer coded by flofrucht.
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Changelog:
v1.0:
initial release
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What is this o_O?:
A simple 6.xx installer, with this tool you're able to install a bunch of 6.xx tools/hens/cfws.
I'll add plugins later ;=).
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How to use?:
Lol, are you kdding?
Launch the .exe and connect your PSP to your PC.
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Credits?:
Yeah, here are the credits:
*Davee for the 6.35/6.31 -> 6.20 Downgrader
*jasnuk for PSPident
*YOTI for the new PSPident updates
*wololo, m0skito and many more for HBL
*Coldbird and VFlame for the 6.3X HENs
*Total_Noob for the 6.20 HEN
*Sony for the version.txt and 500 isofs.prx ;D
*KaZT.U for the RecMenu 0.2
*liquidzigong aka hirmfaxi aka VFlame for the Prometheus ISO Loader
*J416 for the PSP Module Checker
*the entire PSP scene
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Website?:
Support Board -> http://www.pspcfw.de
Blog1 -> flofrucht-dev.blogspot.com
Blog2 (down ;D) -> flofrucht.dyndns.org
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Bye bye, wait for the next update!!!!

Features
*possibility to install 6.31 HEN signed
*possibility to install install 6.35 HEN signed
*possibility to install 6.36 HEN Alpha v3 signed
*possibility to install 6.20 TN-D
*possibility to install 6.35 PRO-B3 and FastRecovery
*possibility to install PSPident 0.73.2
*possibility to install PSP Module Checker v1.0
*possibility to install Prometheus ISO Loader with 500 isofs.prx
*possibility to install HBL r115
*possibility to install 635/631 -> 620 Downgrader
*possibility to install 5.00 version.txt for downgrading
*possibility to install Recovery Menu 0.2

Don't forget -> you need the Firmware EBOOTs for downgrading!

Download -> http://www.mediafire.com/download.php?pb6mv5y07guptom
Official release thread -> http://www.pspcfw.de/viewthread.php?tid=981
Twitter for updates -> http://www.twitter.com/flofrucht