Family Sharing Games Not Launching

[Peak of human evolution]

A friend of mine shared me his Steam library a few months ago and I've played some of the games from it myself. However recently, I am unable to launch any of the shared games I have installed and I get redirected to the store page of a particular shared game I'm trying to play. Along with this, the green "Play" button in library is now a blue "Purchase" button. Regardless if this friend of mine is online (not playing a game/is away) or offline, this issue persists. What do I do?

[my new friend]

1) Some games can't be shared.
2) Sometimes the connection is severed and you will need to set up sharing all over again.

[skkrrttbrrrttt]

Originally posted by my new friend:

1) Some games can't be shared.
2) Sometimes the connection is severed and you will need to set up sharing all over again.

noice

[Peak of human evolution]

Originally posted by my new friend:

1) Some games can't be shared.
2) Sometimes the connection is severed and you will need to set up sharing all over again.

I've played Fallout 4 from the friend's library for a couple of hours before, now none of the shared games work which includes Fallout 4. The Steam shared games that I didn't install are completely absent from my library list.
Could you expand on point 2?

[my new friend]

Originally posted by saul from baking bread:

Originally posted by my new friend:

1) Some games can't be shared.
2) Sometimes the connection is severed and you will need to set up sharing all over again.

I've played Fallout 4 from the friend's library for a couple of hours before, now none of the shared games work which includes Fallout 4. The Steam shared games that I didn't install are completely absent from my library list.
Could you expand on point 2?

Set up Family Sharing again.
https://help.steampowered.com/en/faqs/view/57A7-503C-991F-E9A8

[Peak of human evolution]

Originally posted by my new friend:

Originally posted by saul from baking bread:

I've played Fallout 4 from the friend's library for a couple of hours before, now none of the shared games work which includes Fallout 4. The Steam shared games that I didn't install are completely absent from my library list.
Could you expand on point 2?

Set up Family Sharing again.
https://help.steampowered.com/en/faqs/view/57A7-503C-991F-E9A8

So my friend will definitely have to re-authorize my computer again to share his games?

[Ogami]

Originally posted by saul from baking bread:

So my friend will definitely have to re-authorize my computer again to share his games?

Yup. Just happens sometimes that the Family Share connection bugs out and has to be set up again.

Next time, after you set it up, go into your Steam installation folder and there into the "config" folder and make a backup copy of the config.vdf .
That file has all the saved Family Share connections and some other configurations.
If the connection ever bugs again just exit Steam , copy and overwrite with that config.vdf backup and after restarting Steam it should work again.