Idle master reads your badge page, linked here, it looks for 'card drops remaining'
http://psteamcommunity.yuanyoumao.com/my/badges

Steam gives the cards(not idle master), it only ever gives half set number of cards.
http://psteamcommunity.yuanyoumao.com/tradingcards/faq

You need to buy the rest or trade for them:
http://psteamcommunity.yuanyoumao.com/market/

For very cheap games:

Join http://psteamcommunity.yuanyoumao.com/groups/IndieBundleTracker

For great value, Humble Bundle Monthly

For very cheap see here:
http://dailyindiegame.com/content_digaccount.html

And here:
https://www.kinguin.net/ - set price to 0.6 but note some keys are duds, there is a refund system, it's always worked for me. google 'kinguin' for link

https://www.steamgifts.com/discussion/vsLne/be-alerted-to-free-games-on-steamorigin

Free games info:
https://www.freesteamkeys.com/

http://www.indiekings.com/p/sites-to-get-free-steam-games.html

https://levelskip.com/consoles/Get-Games-Free

The removed one was free steam keys [period] starCOM without the star

You don't need to uninstall IdleMaster to stop VAC errors, just stop IdleMaster and restart Steam before playing the vac game.

For not free-to-play games giveaways, join grab-the-games and other groups, there are lots of games with cards that get given away, you need to complete tasks (like or join group, watch viedo, view webpage etc) and have accounts with (varies) steam, youtube, twitter, facebook etc.

See pinned discussion thread, short answer: extremely unlikely.

Which version?

For version 1.4.1 just delete the folder it's in and delete it's appdata folder at:
C:\Users\YOUR_USER_NAME\AppData\Local\IdleMaster

See:
http://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/133257636766989675/


Suggest clear appdata and reboot.

Have you tried rebooting your PC?
Have you run a repair .net?