So it's been a while since I've used Steam but I found somewhere on the web I had to validate a game before I could play it offline https://support.steampowered.com/kb_article.php?ref=3160-AGCB-2555
Looking at one of the bullets:
Verify that all game files are completely updated - you can see the update status for a game under the Library section (when the game shows as 100% - Ready it is ready to be played in Offline Mode)
This wasn't overly clear but I found something about validation by
right clicking > properties > security > validate offline content (I'm doing this by memory as I'm at work so apologies if that's not 100% correct).
So it loads up a window and begins validating. At about 30% it disappears to be replaced by a new window stating:
1 file failed to verify and will be reacquired. I press OK and nothing seems to happen. I found this article:
(see here for the Google cached version while the forums are down http://webcache.googleusercontent.com/search?q=cache:hlyBLa74OvgJ:forums.steampowered.com/forums/showthread.php%3Ft%3D2216400+steam+rage+1+file+failed+to+validate&cd=1&hl=en&ct=clnk&gl=uk)
but it doesn't seem to solve things. I explored which file was being reacquired using the same process mentioned in that forum thread and it is even the same file as the OP
It's the installscript.vdf in the steamapps\common\rage\ folder.
Anyone have any ideas? I assume I am doing the correct procedure to get offline play, and I certainly don't have the
100% - Ready anywhere obvious that Steam says I need.