I can see that you can use the miles for StarAlliance upgrade award on TG as long as the Booking Class is Y or B.
Here is the partial info from the T&C (Source: SQ website):
25. Star Alliance Upgrade Awards
a. Requests of these awards must be made through KrisFlyer Membership Services or Singapore Airlines City Ticket Offices, in accordance with procedures that may be enforced from time to time for issuing awards.
b. Travel agencies cannot issue Star Alliance Upgrade Awards.
c. Standby upgrades at the airport are not permitted.
d. KrisFlyer miles must be valid when an award ticket is issued. For this reason, members should ensure that ticketing takes place before the KrisFlyer miles expire. Members must ensure that they have sufficient miles in their account before an award ticket is issued. A child nominee requires the same number of KrisFlyer miles as an adult for the redemption award.
e. Members must report any suspected unauthorized award claims from their KrisFlyer account within three months of the unauthorized transaction activity for any corrective action to be possible.
f. All KrisFlyer miles required for an award ticket must be earned by the same member, under the same account number.
g. Travel on KrisFlyer award tickets is subject to capacity controls. This may limit the number of seats available for free travel on particular flights. Award seats may not be available on all flights or in all classes. In addition, some partners may impose blackout periods when award redemption is not permitted.
h. Members can only use KrisFlyer miles to redeem awards. Award redemption cannot be combined with any other means of payment.
i. A passenger’s use of an award is subject to the Terms and Conditions set by both the issuing airline and the airline providing the carriage.
l. Upgrades are available to the next higher class of service. Double class upgrades are not permitted.
j. All carriage on and all tickets issued on behalf of an airline are subject to each airline’s Conditions of Carriage, copies of which may be obtained directly from the airline.
k. Industry discount, agency discount, free or award tickets cannot be used for upgrade awards redemption.
l. Upgrades are available to the next higher class of service. Double class upgrades are not permitted.
m. Miles earned for travel using an upgrade award will be based on the original class of service purchased.
n. Eligibility for the Star Alliance Upgrade Awards depends on the booked commercial class and the participating carrier. This is according to the table below. A confirmed booking on the eligible class is required in order to request for Star Alliance Upgrade Award redemption.
Participating Carrier
Eligible Booking Class for Economy Class to Business Class Upgrade
Eligible Booking Class for Business Class to First Class Upgrade
Air New Zealand
Y, B
No First Class
All Nippon Airways
Y, B
C, D, J, Z
Asiana Airlines
Y, B
C, D
Austrian
Y, B
No First Class
LOT Polish Airways
Y, B
No First Class
Lufthansa
Y, B
C, D
Thai Airways
Y, B
C, D
SWISS
Y, B
C, D
o. The Star Alliance Upgrade Award charts are based on redemptions by segment. Only a single segment of the trip can be upgraded at a time. No complimentary stopover is permitted.
p. The participating carriers are Air New Zealand, All Nippon Airways, Asiana Airlines, Austrian, LOT Polish Airways, Lufthansa, Thai Airways and SWISS as well as such other Carriers as may be advised from time to time.
q. Up to four passengers in a single booking can be upgraded using miles from 1 KrisFlyer account. Partial upgrade of passengers within a booking is not allowed. If KrisFlyer members wish to upgrade some passengers within the booking, the commercial booking will need to be split accordingly.
r. Star Alliance Upgrade Award redemptions are not available for All Nippon Airways domestic routes.
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