I needed to reinstall game because of switching OS from Win7 to Win10, i've copied my sav files to keep progress and now after reinstalling i put them back in game's folder but game won't see them. Anyone know how to make game see it?

I made GOG folder in Saved Games library. I don't think this folder need any special permissions. Of course not, up until Win7 just sav files were enough.
I guess at this point it would be easier to start new game. But next time i'll be prepared. Thank's for the hint.

If you had installed the game into a protected folder, it would not probably be able to save into the same folder, and it would have probably created a virtual store folder. Take a look here as a reference. Well, according to other users, the game should load the save files even without the correct "sally.idx", but the save files' names could be messed up. I don't think that the Windows version could be the cause.
Last but not least, take a look at the strange behavior reported here. It could be helpful.

Before restarting the game, I would try again, experimenting with the virtualstore folder I told you before. Good luck!