Well, I tried both A and B on the x64 version before you even posted ;D but unfortunately both didn't worked. Then I used my Cousins laptop and used the exact same x64 file which I used earlier and it worked. Turns out to be not working only on my system. Anyway, I found a way to play now (laggy yet least playable) Hopefully will get a better Rig later this month ;D thanks alot Kurzidan For helping me out in my whole situation. Your help really did a great job and i finally got to play the game with that savefile. So if anyone having same problems like me...
Follow the steps:
1) Try using another PC with better graphics (might take it from any friend or relative or anyone else) start the game, set the graphics lowest possible and get the savefile or ask anyone who already have the game to upload a savefile with lowest graphics possible.
2) Now Put the savefile in "C:\Users\(Your Name)\AppData\Local\ShopSim\SaveGames"
*Create the folder if it doesn't exists*
3) Try using the x32 version of the game rather than x64 and launch game as an Administrator.
4) The game must be working now. If it still is laggy then change Graphics>Resolution to 50% and Options>Rain FX - Off
5) That must be it. Enjoy the game ;D