Anyone know why were the original Simon the Sorcere games removed? And also if theres any posibility to still get them?

The original games were removed because there is a new IP rights holder, who decided to "remaster" (your mileage may vary) them and release a new version, so the old ones cannot be sold anymore. The originals are included as a bonus of the new versions (full game, can be played independently), so technically you can buy those, ignore the main installers and just play the good old games. Inconvenient as the price is higher than it used to be, but would get the job done.

There might still be some legacy copies in the Community Giveaway (in the General discussions forum), but it requires a minimum participation on the forums to be eligible for a game.