Update INSTALL.md
Update INSTALL.md

with special instructions for 1.25 or higher upgrade
Vishwa1311/incubator-fineract,RanjithKumar5550/RanMifos,RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract,Vishwa1311/incubator-fineract,RanjithKumar5550/RanMifos