Regulations for Renewal of Professional Engineer Licenses Article 9

When applying for resuming professional practice after the existing license expires, the professional engineer shall submit the verification of professional practice and training certificate obtained within six years prior to the application date pursuant to Articles 2 to 6. When the review of application proves satisfactory, a new license will be issued and the validity period shall begin on the date of issuance.
中文原文 技師執業執照換發辦法第9條
技師原執照效期已屆滿,申請恢復執業者,應依第二條至第六條規定,檢附申請日前六年內取得之執業及訓練證明文件;其經審查合格者,以核發日為基準日重新計算效期發給執照。

English translation for reference only; the Chinese text prevails. Not legal advice.