How to install Valve Hammer Editor v3.4 correctly?

Hey, you! We are one of the oldest mod sites on the Interwebs. Sign up and maximize your browsing experience.

  • Subscribe: Get notified of new submissions like this.
  • Say Thanks: Show your appreciation by sending A Cube Box points.
  • Post: Give A Cube Box your thoughts on this Thread.
  • Flag: Alert moderators and warn members of a problem with this Thread.
  • Watch: Get notified when this Thread is updated.

Stop Lurking!

Join GameBanana

Already a Bananite? Login

Hello there, I actually downloaded Valve Hammer Editor v.34. But, when I run the setup program, why it says "Illegal character detected in the installation path. You may not use the following characters as part of your install directory (? / : * " < > | ;) " ??


  • 4mo
    LiveWire avatar
    LiveWire Offline
    Member Joined 8y
    6,489 points Ranked 676th
    14 medals 2 rare
    • 6 years a member Medal icon
    • Returned 1000 times Medal icon
    • Reached 1,000 Points Medal icon
    • One month a member Medal icon
    • 6 months a member Medal icon
    • 1 year a member Medal icon
    Try installing the Half-life SDK in your steam library > tools

    It contains Hammer, follow this guide to update it.


Shareable Image:
Share banner
HTML embed code:
BB embed code:
Markdown embed code:

More embeddable images

Bookmark and Share


A Cube Box avatar
A Cube Box Offline
Complicated Inc. Flag Affiliation: Complicated Inc.
Member Joined 5mo

A Cube Box Complicated Inc. Flag
Complicated Inc.
Send a Private Message to the submitter



Installation Errors
Valve Hammer Editor v3.4


Date Added
4mo tracking pixel