The various county treasurers shall not issue any tax-sale certificates nor shall the various county clerks execute any tax deeds prior to September 1, 1939, for lands bid off for taxes in the name of the county: Provided, That with respect to all lands bid off for taxes in the name of the county at the tax sale of September, 1938, or prior years, no tax-sale certificates nor tax deeds shall be issued or executed so long as all the current taxes beginning with taxes due November 1, 1938, have been paid: Provided, That if such lands have not been redeemed prior to September 1, 1941, tax-sale certificates and tax deeds shall be issued and executed as provided by law: And provided further, That unless such current taxes had been paid, tax-sale certificates and tax deeds shall be issued as provided by law: Provided further, That tax deeds may be executed in those instances where compromise tax-sale certificates have been assigned prior to the effective date of this act [*].