Where, after the effective date of the Act,[3] a curative amendment proposal is approved by the grant of a curative amendment application by the governing body pursuant to this section or a validity challenge is sustained by the Zoning Hearing Board pursuant to § 150-298, or the court acts finally on appeal from denial of a curative amendment proposal or a validity challenge, and the proposal or challenge so approved requires a further application for subdivision or land development, the developer shall have two years from the date of such approval to file an application for preliminary or tentative approval for a subdivision, land development or planned residential development. Within the two-year period, no subsequent change or amendment in the zoning, subdivision or other governing ordinance or plan shall be applied in any manner which adversely affects the rights of the applicant as granted in the curative amendment or the sustained validity challenge. Upon the filing of the preliminary or tentative plan, the provisions of Section 508(4) of the Act[4] shall apply.