Just updated the beta and alpha packs for MCPE to add in more features (Biggest feature is old title screen) and to better support MCPE 1.0.
You need to update the links on the thread.
Firstly, thanks for porting the pack!
Tried importing your Alpha pack and noticed that it gave a few warnings. One being that you're not using a valid UUID for the pack_id. (This can be seen by going to Global Resources, tapping on the pack, and tapping on the warning sign that appears.) You should probably generate a UUID for the pack and use it, just in case it every becomes a required part of the format. Here's a good UUID generator that was mentioned by an article on minecraft.net:
And here's the article, which has some other useful add-on tips for pack-makers. https://minecraft.net/en/article/new-add-ons-features-10
EDIT: To be honest, I can't figure out at first glance what's wrong with the pack_id you're using in the Alpha pack. The Beta pack is definitely using an invalid one, though.
Your packs_version was also not SemVer compliant, according to the in-game pack validator. EDIT: Additionally, the packs_version field is intended for the MCPACK format version, not the version of the specific pack itself. (The current pack format version is 0.0.1, I believe.)
The same errors happened with the Beta pack, plus a syntax error. You should probably check your pack_manifest.json for errors/typos.
Also, while the main menu screen uses a flat dirt background, all the other menus do not. Also, the pause menu has this weird black thing instead of the Minecraft logo. Not sure if any of that can be fixed or not, but just thought I'd let you know in case you didn't already.
Also, I have some other suggestions for future versions of the MCPE port of this pack:
* Add in the Java edition rose bush & peony textures - MCPE has modified versions, and I think that since these packs are emulating the Alpha & Beta stages of JAVA Minecraft, then other textures should match that edition as well.
* mobs.json allows for changing geometry like you did with the zombie villager, so you could make pigs have flat snouts again through a simple model change & texture swap.
Again, thanks for putting in the effort to port this pack to MCPE!