Came here looking for a solution to the same thing. Fresh install. "No Input File Specified" when clicking on the install tab.
Support Request Template
What version of phpBB are you using? phpBB 3.2.0
What is your board's URL? http://www.crownofthevalley.org/forum
Who do you host your board with? GoDaddy
How did you install your board? I used the download package from phpBB.com
What is the most recent action performed on your board? new installation
Is registration required to reproduce this issue? No
Do you have any MODs installed? No
Do you have any extensions installed? No
What version of phpBB3 did you update from? new install
What styles do you currently have installed? just the default
What language(s) is your board currently using? just the default
Which database type/version are you using? MySQL 5.5 (I think)
What is your level of experience? installed a phpbb a couple years ago with success.
What actions did you take (updating your board; installing a MOD, style or extension; etc.) prior to this problem becoming noticeable? Brand new install
Please describe your problem. I followed the instructions here: docs/INSTALL.html
Do I need to put a database in place first, or is the phpbb installer supposed to do that for me?
Thanks in advance for any help.