[TYPO3-shop] tt_products error in 2.7.4 upgrade

[Man Math]

Dear All,

I just upgraded to 2.7.4 of tt_products (previous 2.4.8) and there are 
two problems happen:

1 - Backend flexform: field select "Category mode" is missing

2 - Frontend is visible.

Are there any suggestion or good solution?

Thanks,
Man