Aravisian has suggested a better alternative for the spec of your tablet, Antix.
If you ever want to try to download Zorin in the future I would visit source forge instead and if you have issues with their automatic server selection you can manually choose a server closer to where you reside.
The MD5 checksum is another method to verify and for 15.3 Lite it is:
4b979e2f50497a2f353fd9ef6e0809d2
I made a video on how to do md5 checksum in Windows 7, should also work in Windows 10.
https://www.veoh.com/watch/v28335038JpeNGXzP
I also included all the SHA checksums for all Zorin 15 (up to r2) variants and earlier releases on page 9 in the unofficial manual I wrote for Zorin 15:
Here are a few more alternatives:
https://www.makeuseof.com/tag/5-lightweight-linux-distros-ideal-intel-atom-processor-pc/