1) Install Minecraft Forge for 1.7.10 (run minecraft with forge once, if you have never done so before)
2) Download the Lucky Block Mod for 1.7.10 (https://www.planetminecraft.com/mod/lucky-block/)
3) Locate your .minecraft folder and put [1-7-10]_Lucky_Block_v5-1-0.jar into your mods folder.
4) Run minecraft at least once, and keep the mods folder open.
5) Open up [1-7-10]_Lucky_Block_v5-1-0.jar with 7zip or winrar and go to assets/lucky/textures/blocks
6) Replace lucky_block.png with the lucky_block.png that came with this download.
7) Go back to your .minecraft folder and locate the config folder
8) Go to config/lucky and replace LuckyBlockProperties.txt with the LuckyBlockProperties.txt that came with this download.
9) You're done! :D. If you have any problems please let me know on CurseForge!